For me, it would be the 360. And so you won't bother me about it (sometimes it's better to just let people disregard your thread rules), I'll explain why.
This generation, the 360 has provided me with the most fun. I'll start with why I didn't like the PS3 and Wii as much. With the PS3, I just haven't experienced enough of it yet. I only have 2 games, and whenever I go to buy more games, the shelves are poorly stocked and I just buy 360 games instead. I could deliver by Amazon, but I vastly prefer walking into Best Buy's pristine isles.
As for the Wii, it's disappointed me on several accounts. Super Paper Mario belongs to one of my favorite series of all time, Paper Mario, but completely strays from what made the other games great. I wanted an RPG, not a platformer that's light on RPG elements. Super Smash Bros. Brawl was fun for a while, but after hyping the damn game for years, it disappointed me massively. Seriously, I hyped this game up with my friends for a long time, read every site update, and flocked to forums over every menial announcement, and it just failed to meet the hype. And the same thing happened for Super Mario Galaxy. While I enjoyed the game greatly, it in no way matches its acclaim.
And that brings me to the 360. The 360 had the least anticipation for me when I bought it (I didn't like the original Xbox much at all), and it really surprised me. Bioshock had a great atmosphere and story, and it was fun to customize my weapons. Halo 3 had as boring of a campaign as the other games, but I spent hundreds of hours online. Gears of War 2 had not only a great single player but some very fun online, as well as Horde mode (which got boring quickly, but was fun for a couple weeks). Throw in some really great exclusives and just about every multiplatform, and you're looking at a system with a very complete library. It really seems to give a whole range of genres and experiences, and I never have trouble finding out what games to buy for it. Add in a great online system and a comfy controller, and you've got yourself a really great system.
Okay, hopefully I fulfilled your requirements.
