It does get better after the opening, and there is some really fun combat in there, but I wouldn’t say it’s worth the time investment. One of those where for me it was a bit of a rollercoaster - I spent the first few hours hating it, then a few hours liking it, then 20 actively enjoying it, then the final 20 actively hating it again. It’s a fantastic concept for a Mass Effect game but it feels so unfinished in so many ways and I remember barely anything about it now.
Edit: I do think the graphics and animations weren’t as bad as made out. I did play a while after it came out so maybe patches improved it a lot, but I think a lot of the game actually looked pretty good and certainly better than the original run!