So, I remember talking to Bentendo about Metroid: Other M, and he said the voice acting was bad. Having played a bit of it for myself now, I can say that while the voice acting isn't the best it could be, it was tolerable, and WAY freaking better than Arc Rise Fantasia!
Another thing that's been going around is Samus's character in the game. Most people say it clashes with her previously set-up character... or lack thereof. Here, watch this video to get a good feel of what her character was like before and after Other M
http://screwattack.com/videos/TGO-Episode-40-Heavens-to-Metroid
Note: Some people argue that it clashes with her character in Metroid Fusion, which Bob Chipman (the Game OVerthinker) didn't bring up, while others say it didn't. So, I don't know, I haven't played that many Metroid games.