This is a super interesting question. I'm gonna come at it from the angle where I'm thinking about the ones I often see disrupting or derailing good stories, rather than ones I just think are weird (because that's a long list)
Over the years I've been here, my writing style has shifted and I don't use individual powers in my writing unless I need to provide my writing partner with an easy understanding of what I'm doing in PvP. I prefer to imagine that Force Users can do basically anything and that powers are just ways to focus the mind to achieve an effect. To that end, I don't think any one Chaos character or power is too strong, but I definitely agree the balance should be towards what people can do in the movies and tv.
Anyway here's my list
1) For a long time this was Wall of Light, a power which for some reason nobody could agree on its scale or effect- i.e. was it a targeted burst of energy, or a Force nuke? Could it be resisted, or not? The result? Anytime anyone used it there was immediately confusion, arguments, and a muddy story.
2) Tutamunis - This is one I think is often misused in PvP threads for blocking literally everything. It's generally fine and cool in pitched battles between super strong Force Users who can work around it, but with NFUs and less strong FUs it has a tendency to throw things out of balance a bit.
3) Same goes for Force Drain. This is often used as an unblockable 'I win' button to end a duel. IMO most of the people who use this one don't balance it with an appropriate drawback to allow their writing partner to respond.
4) Force Dead - This one is very strong in its own right, but I feel hardly anyone writing a character severed from the Force includes the many many drawbacks that would come with that. Yeah it's a big PVP advantage but in almost every other respect it's a massive debuff. Personally I think that's why it usually comes out half baked.
Overall, I like and have used any of the above. They just need to be treated with care and be fully fleshed out, and in PvP, should still leave your partner with options.
...
Maybe just avoid Wall of Light