A decent experience, but not quite up to the high standards of the game.
Kasumi's Stolen Memory introduces another addition to Shepard's squad. Keeping with the team of many talents, Kasumi offers up some pretty nice skills thanks to her master thief career path, which is exactly why she has been recommended for your mission (if you have already completed this mission as I have, AKA beaten the game, then just consider it one less vacancy on the Normandy. Stupid Collectors…). In return for her services she asks the favor that Shepard help steal back something that was stolen from her late partner.
ME2 did a great job at deeply integrating the majority of the squad members into the game, especially in concern to the missions revolving around these characters. Unfortunately for Kasumi, she gets the Zaeed treatment. Her recruitment "mission" simply involves flying to the Citadel and a brief, secret chat with her through an advertising screen (though I am not quite sure why this is necessary considering she is standing right above you in view of everyone). Once you agree to help her out simply get back on the ship and get ready to start her loyalty mission. Once you reach your destination Kasumi briefs you on the man throwing the party you are about to crash and the role you will play in order to pass through the crowd unnoticed. This is when I got really excited because I was expecting a nice blend of 007 and Captain Tightpants awesomeness (the latter being a Firefly reference). But unfortunately this mission is almost as disappointing as the short jaunt to the Citadel. In order to fulfill the mission you have to run around the party doing certain things that you would expect to be noticed for, and when you are its simple to get out of that pickle quickly enough, stealthiness fully intact. In other words, there isn't really that strong of a challenge to it. That, and the scope of the location is just sad. All I wanted to do was hop those stupid ropes blocking the stairs, but unfortunately it was not to be.
Though the actual objectives during the mission weren't quite what I hoped they would be, I was still excited for what I hoped Kasumi had to offer as a character. After hearing about her character I was expecting something along the lines of Thane's character, with his stealth, agility and general awesomeness, but like I said before, she isn't given the treatment she deserves. Instead she is about as talkative as Zaeed, minus the ability to bring about pure hatred from anyone who has to be around him (well, at least that is true for me). When talking to her back on the Normandy she isn't even given a dialog wheel, with only a few interesting tidbits of information to pull from her when interacting with items in her room. So sorry to say for those of you interested, but this means she is not a possible love interest in game.
Kasumi's character definitely shows a lot of untapped potential considering the lack of dialog options, but she should be a pretty nice character to take out on other missions during the main body of the game. During the latter portion of this DLC there are hints of what she is capable of out in the field, and it is amazing to watch her go flitting around the room like Nightcrawler, dispatching enemies in a game of "now you see me, now you don't (as I smash you in the back of the head)." But until I let her loose out in the field, she remains a little underwhelming.
Mass Effect 2's first major DLC pack had the potential to be a really great addition to this phenomenal game, but unfortunately it is not as developed as it should be. When you get down to it, the experience is short, not as challenging as one would hope, and ends with a boss battle finish that isn't really anything new. But most unfortunate is how Kasumi's character is about as fleshed out as a rock that you scraped your knee on. Hopefully with the next character they add to the game (I am pretty sure I saw another empty slot, but I could be lying… Did someone die during my initial playthrough?...) they will have learned from their mistake.