There are definitely a few tiny bits of dialogue in TFA that I'm not totally OK with but I think for the most part all of the cast pulled off good (if not great) performances. Driver played a pretty convincing villain with the mask on but also did really well without it (especially the Han scene & final fight(s)). Boyega and Poe had great chemistry throughout and although I can see how Ridley's performance could annoy people I think it's more to do with her lines and people not believing (or wanting to believe) that she was capable of things like fixing the falcon/flying the falcon or using a lightsaber.
FWIW I didn't like Finn's forced American accent when he says "we need cover, quick" but it's literally the only point in the film where I couldn't tell Boyega wasn't American. There are a few moments with Driver sans mask sounds like Kermit the frog that I wish they had recorded again but then again that is his real voice and he was playing a tricky character again with difficult lines. I would imagine it's hard to make a scene like the Han death scene as emotional as it needs to be when you are playing a guy trying his best to hide his true feelings and emotions in front of his on screen father!
Like I said way back after first seeing it, the things I don't like about TFA are minor irritations and really, which film doesn't have errors or bits that make you cringe? I think it's a great film and I've seen it about 8 times now.
For some reason I still struggle with Jedi as an adult, I always skip the same parts of it and I can't remember the last time I watched it from start to finish without doing that. I love the start, I love the end - but the rest is boring (yoda passing away) puppets (most of the Jabba scenes) and then those wonderful midgets in fur.
I think in comparison TFA definitely holds my attention for longer and has less moments where I really feel like skipping to the next scene although I've probably seen Jedi hundreds of times and TFA only 8 times in comparsion, so maybe it's just a case of me being fed up of watching Jedi?