Hate Desmond? I guess I can see why people don't like him, and while I don't think he is an AMAZING character or anything, he alone was the reason I got through AC1. I didn't care for Altair (thought he was insufferably boring), and I just couldn't wait to get out of the Animus, talk to Lucy, and read some of Vidic's emails.
And while I loved Ezio in AC2, I was actually pretty sad when you really aren't forced out of the Animus to talk to your friends that often. Even when you left after a few segments, they still didn't really have much to say. I loved how important they made Desmond seem with that game's twist though. Brotherhood fixed most of the modern day problems I had with Desmond, giving his friends a lot more to speak about and seeing some Abstergo enemy footprints through eagle vision while walking around was especially creepy.
Then Revelations came around and didn't give us much of anything. Oh sure, we explored his backstory in some nice rooms that dealt with his past and stuff, but he didn't interact with anybody of consequence. In AC3 he once again had a lot more to do which was nice, except for the end that just sort of left a sour note about him. Connor had a tendency to be boring and not boring, switching back and forth for me, so it was nice to take a break and do something else, even if it was only for barely 20 minutes.
So yeah, I actually like Desmond though I don't place him on a pedestal. I mean, the past stuff was nice, but I wasn't really attached to much of the characters. I saw AC as the story of Desmond, and trying to piece together what was going on, who was friend or foe, why he was so important, was the main draw for me. That's why I played the games. The other gameplay stuff sucked me in too (Must get every Bank, Tailor, destroy ever tower, Codex pages, etc), but I kept coming back for Desmond/the modern day stuff.
Though I will wait a bit on AC4. A bit too soon for me, especially since I played Revelations and AC3 almost back to back. I'm actually really interested to see where they take the modern day stuff next.