I grew up with comics portraying Marvel (and DC) characters and it's unlikely I'll tire of actually seeing them. I knew Thunderbolts was going to be different from usual Marvel fare, focusing more on characters than usual, less on splendid special effects than usual, so I wasn't quite sure how it was going to pan out.
The short answer is that I enjoyed it. Florence Pugh pretty much carries the film as far as emotional stakes are concerned - the other characters are much more one-dimensional. But even so, the team-building was good. The baddie was also quite good, his power growing with his mental instability, although my main quibble with the film is that on Monday he can barely make a cup of water boil, but on Tuesday he's as powerful as Superman, or even more so.
It's certainly not a dud, as some have predicted it would be. I certainly wouldn't try to dissuade you from seeing it.