IMO I thought they were about equal in problems. Both are in my top 10 games this gen.
Final Fantasy XIII's art design and music were quite superior imo
Mass Effect had interesting dialogue options that really affected nothing besides a few really good missions (morinths). Compared to (alpha protocol)
Both had poor dialogue at many places (though FFXIII had some amount more of poor dialogue)
They both had fun gameplay systems that got a bit stale because they were both extremely linear. Meaning for the most part. You did the same thing over and over with exceptions.
Both had Great universes with some good parts to the story. With FFXIII having some bad parts, and Mass Effect 2 having a lot of useless filler parts.
Both had some great characters the best (Mordin) coming from mass effect. And both having crappy ones (Hope, Snow, grunt and jacob).
Both streamlined and it caused good and bad things.
That considered I give both games a 9 and love them both completely.
