This is my list - it's chronological rather than a ranking - what's yours?

#1 - R2-D2 Astromech Droid - 90% of the pieces in Revenge of the Sith have been left behind as the game has advanced, while this guy's still an auto-include 7 years later. The game's first big movement breaker, and he also made the Republic the only faction except Rebels with door control; two huge game altering abilities for only 9 points.

#2 - General Dodonna - San Hill and Ozzel would be on the list if Dodonna didn't exist, but Dodonna's tempo control without the downside of having to activate only 1 piece per phase took it to the next level.

#3 - General Obi-Wan Kenobi - too cheap for Soresu Style Mastery and a great Commander Effect.

#4 - IG-Lancer Droid - the ability to rip through a squad without risking any damage in return doesn't make for fun games.

#5 - Poggle the Lesser - I like the idea of giving fragile Sep pieces some defense against the Lancer, and bringing a previously useless piece, the Geonosian Drone, back into play, but the Drones ended up too strong.

Honorary #6 - Gha Nachkt.

It's interesting that it doesn't include any Imperial pieces, given that Imperials are the dominant faction this Regional season.

1. I agree R2
2. Darth Bane (he can assault and sith rage which against a jedi tht 100 damage combined)
3. Exar Kun (can basically teleport any where and make all his attack)
4. Luke Hoth pilot Unleashed (force pushing on sight)
5. Reiken giving all rebels Evade and mobile

Well... This is tough... I will go V-set top 5 and non v set top 5

Non V set
5. Dodonna/Ozzel/San Hill- Complete crutch pieces that just allow slow play ( which unfortunately is almost a necessity to be competitive now)

4.Lobot/Gha Nacht- To me these 2 walk hand in hand. Because adding 10 activations after seeing someone elses squad is just ignorant.

3.Thrawn Mith- Another crutch piece. MT, Swap, And Opp means 0 skill to play it effectively (with all their other crutch pieces of course)

2. Mas Ameda- I absolutely hate Mas. Full board swap is probably one of the stupidest things this game has, even if there are ways to counter it. It just shouldn't be there to start with. And Commanders are made out to be pansies now because of this piece. Do we really think these awesome commanders came to the position of power they have by being weak?

1. And my least favorite WOTC piece, the Mouse Droid. 3 (sometimes 2) points for a 20 d piece that can clog up hallways and provide cover? All while carrying CE wherever they want? SMH Wizards.

V/Sets, I will be less harsh here

5.Darth Bandon- I know he isn't tearing the scene up or anything. But he has effectively kept the cost of Sith pieces slightly higher simply b/c his CE is to good.

4. Darth Zannah- If know one likes GOWK... Why would we want a piece that can not only negate damage, but reflect it back to you? And Force Bubble is over kill... Throw in the Force Spirits... And it just keeps going and going and going.

3. Bastilla- I wouldn't mind her half as much if the FA ended at the end of the round, instead of the beginning of her next turn.

2. Poggle- 2 point pieces that can blow up to do 20 damage or not die on a save of 16? for 9 points? C'mon Man!

1. Mace LOTS- Now I know counters have been set forth for this piece so his effectiveness is cut out alot. And Mace Windu is my FAVORITE Star Wars character. But this piece should not be in this game at all. The ability to do unlimited damage on an opponents turn should never be an option in this game.

5.Mas
4.San
3.Ozzel
2.Dodonna
1.Panaka of Theed

V-set top five...

5. Mace Windu, LotLS - Flurry? nuff said.
4. Panaka of Theed - the rapport is the big issue.
3. Poggle the Lesser - 2 point drones and the CE.
2. Darth Malgus, The False Emperor - mainly because of the FYD save of 16 coupled with no LoS or cover w/in 12".
1. Bastila Shan, JM - only because of her cost.

Just missing the list is the Klatoonian Assassin but probably should be in there.

Jem. She is truly outrageous. All others pale in comparison. :)

Oh and I'd say Mace LOTS, Bastila, Cadus Sith Lord, GOWK, and I'm still looking for more.

Not necessarily, Andy. Pieces that people call 'crutch pieces' are pieces that are undercosted. Some do affect the game in negative ways as well, but that doesn't mean you shouldn't use them. R2, Mas, Dodonna, Rieeken and Thrawn(s) are all pieces that are over the top but have been 'must includes' in their respective factions. (I think for the Rebels Dodonna and Rieeken aren't as necessary now, thanks to Vset designs.) Some of them may suit your playstyle, or just necessary for your preferred faction. No need to apologize to people who don't like them. Personally, I like playing Imperials. Thrawn is undercosted and just has more on him that ever should have been there, and perhaps Mas should never have been made. That being said, I like the abstraction of the swap and think it fits the character of Thrawn perfectly. And, even though Master Tactician and Opportunist should never have been piled on top of that I will continue to play him and without apology.

Wow there are some pretty big names that I think are missing.
The sad thing is I love most of these peices

5.) Doombot (Door control, movement breaker)
4.) Mas Ameeda (Booming Voice Swap)
3.) Nom Anor (Super Stealth, Self Destruct)
2.) General Wedge (Evade, Mobile Attack)
1.) GG-DAC (Single Handidly jacked up sep droids to crazy levels)
Honorable Mentions: Lobot, Gha Nackt, Boba BH (just for disentigration), Cad Bane/Captain Rex
VSETS: FYI I love all these peices, I do concede however that they are kind of obnoxious and The rest of the community sure agrees.

5.) Poggle (Same reasons as Nom Anor just different effects)
4.) Zannah (GOWK only on sith)
3.)Mace LoTS (Insane)
2.) Caedus (crazy good force powers)
1.)Kelborn (mando movement breaker along with being phenominal by himself)

I find it interesting that you included Zannah, but not GOWK. And Kelborn, but not Yammosk War Coordinator. Also, just out of curiosity, why did you choose General Wedge over General Rieekan?