Why are we paying for something that should have been in the original product? Shame on Bioware!
Just for the sake of clarity as well, I did not buy this out of protest and principle - however one of my friends did, and I played it over at his place. I figured I'd see what Bioware was offering, since he had already bitten the bullet. And let me tell you, I was glad I did not buy this, despite being a huge Mass Effect fan.
This is essentially another Zaeed - a shallow, useless character with no interaction outside their main quest. Kasumi fails to be memorable after her short (albeit amusing) quest, reduced to a few lines when clicking on things around her quarter. As someone who loves the ME series due to character interaction, this was a huge disappointment. Why even bother sticking in a character if you're not going to develop her at all?
The reason why I didn't give this a lower score is for two reasons. First off, the mission IS fun, but the fact it is so short is a big hit against it. Secondly, Kasumi is a decent regular party member, but I found this useless because I (and my friend whose account I was playing) had already beaten the game twice, and she was just an afterthought. If she had been released earlier, perhaps it would have placated me more.
I say that we as gamers should take a stand and refuse to buy crap like this on the laurels of past accomplishments. Bioware is milking us, and I think we should do something about it.