Summary: This is by far the most popular game in the trilogy, but it's my least favorite of the three. It's still worth playing, if only to connect Mass Effects 1 and 3. But, again, most people like this the best.
Summary: Game is wonderful, played ME3 before playing this game. Compelling storyline, adorable Collectors, good combat mechanics. Legion is a wonderful geth, Tali is an interesting Quarian, Grunt is a big bad a** and Garrus is just the best marksman, PLEASE BE WARNED.
Summary: I would actually give it 4.5 out of 5, but since Amazon won't let me, I'll have to go with 4. Some of the new systems in the game are simply annoying (Planet Scanning). Others are good advancements.
Summary: Not a bad addition to the Mass Effect universe but nothing special either the Overlord DLC fills in a bit more of the back story of what Cerberus gets upto in its spare time, with a mission involving bailing a Cerberus cell out of the trouble they've got themselves into.
Summary: Kasumi is one of the best designed characters in the series to this point, featuring skills and talents that later went on to get used for the 'Infiltrator' class in Mass Effect 3. Stolen Memory heads off on a tangent from the main Mass Effect story to provide you a brief break from dealing with the...
Summary: Mass Effect 2: Overlord feels like a glorified side mission. However, that doesn't stop it from being good. You get to use the Hammerhead to "explore" the planet (not to the extent of the planets in ME1) and go to your objectives.
Summary: Kasumi Stolen Memory is the first paid DLC for Mass Effect 2. It offers a really good mission, an awesome weapon and, of course, Kasumi, your new squadmate that will follow you to the Suicide Mission.
Summary: Not bad, but nothing special either. This DLC certainly gives a few plus hours of gameplay to the game. The ending is emotionally powerful. Overall: Nothing outstanding, but still an enjoyable extension of the game.