I really thought blood money was okay, altough I never completed a single level in 100% stealth (ie, dont even slip out of your suit) mode, which I did with contracts. Contracts was awesome that way. First finish it any way you can, then try it again without ever disguising yourself. Is hard, rewarding work.
About MGS: Altough I'm really a fan of the series, who owns the first game on the original cartridge, I'm more than dissapointed by the friggin manga-turn the series took. I wanna snap some necks, not watch videos about relationships. What is this? A friggin chick flick? Seriously. If I wanna chick flick, I get one. You dont write chocolate on a package and put shit in it.
Splinter Cell: Shadow mechanics might appear stupid, even to two-digit-IQ folks, but for some reason, the games can be very enjoyable. The guard dialogues, whether among the guards themselves or with sam fisher, can be hilarious. Co-op Mode in Chaos Theory is pretty darn good, too. MGS should have gone were Splinter Cell went. In a dark and manly corner, hiding and preying.
Whatever you do, AVOID double agent on the wii. It's alright, but they make you pay full price for half the content, and sometimes that leaves you with VERY weird mission logic.
I think "Prisoner of War" hasnt been mentioned yet, and I really enjoyed that one, too, at least on the first playthrough. Actually I thought this was one of the best stealth games I ever played. I just wished it was longer. Dunno whether or not there have been any (worthwile) sequels.