I'm tempted to replay Mass Effect 2 along side you. It's easily in my top 5 games of all time. Really flawless experience. The best thing Bioware has made too!

The one thing I would say is that you HAVE TO play it with the DLC. There's a lot of DLC for the second one. In total, it nearly doubles the length of the game overall. And it fits into the main game fairly seamlessly so you don't need to wait til you've finished it or anything like that. Stolen Memory, Overlord and Lair of the Shadow Broker are all of the same quality as the rest of the game.