I don't know if anyone remembers, but I wrote a
review of ME2 that was fairly negative. Apparently
my review of ME3 isn't getting nearly as much attention, because even though I'm saying a lot of the same things as my ME2 review, a lot of those points are now being widely repeated. Yes the review does contain spoilers, so be warned.
The ending didn't bother me as much, but I suppose it's because I'm not a big plot person. I don't think I would have been any happier with the ending if I saw little cutscenes tidying up every other race and character's story. Anyway, I thought the plot went out the window with ME2 mainly being about solving your teammates dysfunctional family issues and "a human reaper!".