Saw it last night and this pretty much sums it up. Although I think Ridley's acting was only good insofar as it related to her performances with Driver. Every other character and relationship dynamic was essentially non-existent and two-dimensional. I think Boyega and Isaac did their best given the circumstances, but they had very little to work with. The only silver-lining I found was that the dialogue and script was SO BAD that it was entertaining (for all the wrong reasons) and couldn't help but wonder if the three main characters only genuinely emotional scene at the end where they were all hugging was because they won the war or because the actors knew they would never have to film another Star Wars movie again.
Whoever wrote the script suffered from 'Chronicles of Riddick' syndrome where they packed 2-3 movies worth of material into one movie, sacrificed any notion of character development to move the plot forward, and figured they could distract the audience with huge explosions and nostalgic characters to make up for it.
All in all, the movie is a sign of the times.