For the longest time I absolutely despised Old Republic. During the WotC era they were indisputably the worst faction. Now though, with the V-Sets, they're becoming one of my favorites. I really like the Covenant and Tales of the Jedi stuff.
Worst faction has got to be the C.I.S. These guys have had nothing going on since Poggle Bombs. I feel they suffer from a very disparate design issue. You either go all in on droids with a Grievous or you try some jank living seps build with Asajj, Dooku, Maul. The two do not mix. And the droids just aren't good enough to compete with how the other factions have power crept. And living seps, well... They're just not good.

I have a theory that the vong are the most powerful faction in the game, but nobody's figured it out because everyone hates them.

Worst faction competitiveness is Vong. Biggest NPE is a different story though.

I think we should adjust Faith in the Force to not affect the Vong. Vongsense should be the only way to affect Vong with the Force. I think this must have gotten overlooked in design because, lets be honest, most people don't play the Vong or care about them. It'd be a simple change really:

Faith in the Force (This character and allies with a lightsaber within 2 squares cannot be prevented from spending Force points or be forced to spend extra Force points. Their Force powers cannot be cancelled or prevented from affecting non-Yuuzhan Vong characters.)

Right now, I believe the Rebels are the weakest faction in the game. They suffer from weaker stats and less impactful synergies. They’re one of the more popular "good guy" factions. Yet when it comes to high-level competitive play, almost no one trusts them to carry the day in a big tournament.

On the opposite end of the spectrum, we have the Yuuzhan Vong, who remain the least popular faction by far. But make no mistake — they are not weak.

Yo’gand— the Eighth Cortex Shaper! Yes, they're powerful. Truth is, our design team has done an excellent job of diverting players away from the more abusive Vong builds. But those squads — the ones that terrorized tables 6 years ago — are still devastating. The Vong can pull off stuff no other faction can even dream of… tricks that the Balance Committee nerfed into the ground for everyone else.

It's why Faith in the Force was designed — a deliberate, intentional counter to the Vong. We put it on Lor San Tekka, a cheap non-Force user, as a tactical choice.

He’s a New Republic piece, representing the faction that defeated the Vong.
Tekka’s whole deal is collecting esoteric Force knowledge and obscure Jedi lore, making him a natural carrier for something this specialized. Vongsense — the ability to detect Vong through the Force — is usually tied to connecting with Vong bio-tech. But in the Expanded Universe, a handful of Force users pulled it off without any implants at all. Think Celeste Morne, Allana Solo, or the legendary Ganner Rhysode, who literally became one with the Force to hold off hundreds of Vong warriors single-handedly. Faith in the Force is meant to capture that kind of moment.

Then much later, the same set used Faith in the Force on both a Champion piece and a Community Playtester piece. That’s a lot of power, sure — but I think the design team and playtesters did a solid job keeping things balanced.
At GenCon, I ran Revan against Hi-Fives Yo’gand squad. Let me tell you — the only reason I squeaked out that win was because of Jordan’s bad rolls. The match could’ve gone very differently.

I get that not everyone can make it to the tournaments, but if you really want to understand how the meta shakes out at the highest level, there’s no substitute for being there in person. Seeing the top squads in action, watching how the best players adapt on the fly — it gives you a whole new perspective.

i just don't like how squishy the rebels feel. they just don't feel like they do enough for such low hp some of the time

We just need a few competitive rebel pieces that synergise well to make them great again. Still pretty good for our wotc only friends though.