User blog comment:Darkshark74/What Will You Play After Mass Effect 3?/@comment-2250460-20121001165123/@comment-2250460-20121001211525

I have only 3 and New Vegas, and they are awesome. You start out super weak but as the game progresses your character gets so powerful nothing can stop you.

Both games have really good endings that take account of every single thing you did (New Vegas takes this up to 11, with trivial side missions having a big impact).

I would recommend trying 3 before getting New Vegas, to see if you like it.