I am the same way. I wouldn't say I liked 9/10 of these as nomad240 said earlier, but I certainly would say I wasn't disappointed by 9/10 of these. I only liked maybe 6/10 of the ones mentioned (that I've played).
One that I haven't seen mentioned much on here is Final Fantasy 14. Final Fantasy 11 is still my favorite MMO of all time, and I was so excited when final fantasy 14 was announced. Unfortunately, then they thought it was a good idea to rush it out before World of Warcraft Cataclysm came out (yet another reason to hate world of warcraft)... The resulting game is an absolute mess. It is so bad, that Square keeps extending the free to play period (I think it is free to play indefinitely at the moment). This game is by far the one that made me the most disappointed I had bought it by far. I played for 2 weeks (almost non stop, though trailing off quickly at the end), and then decided to cancel my account (despite it being free to play).
Second place would have to be Dynasty Warriors 6, but if the amount of disappointment ff14 brought me was the empire state building, Dynasty Warriors 6 was a studio apartment. This was only disappointing because prior to 6, I had only played Dynasty Warriors 3 and 4 (those who are knowledgeable about the dynasty warriors series know these to be the two best of the series). Dynasty warriors 6 dumbed down the battle system, and made horses/weapons randomly generated. They also made very few of the characters playable in story mode. From what I hear about DW7 (OUT TOMORROW IN THE US!!!) it fixes all of these complaints.