Wii- Wasn't happy with it I first bought it, had it for around a year and traded it in. Can see why people like it, but not for me. I guess it's just the idea behind it and the fact that I got tired of Mario so quickly that killed it for me.
PS3- Didn't buy until semi-recently, hasn't been played too much except for the occasional Uncharted 2 or MGS4, but I'm happy with it if only for the blu-ray player.
360- Probably my favorite console of this gen. Has the most exclusives that I like (CONSOLE exclusives, mind you, not gonna upgrade my PC every time a new highly polished game comes out) have never had any technical problems with it, though I bought it in 2008, and from what I hear the ones they made from then on have very low failure rates. Is a bit loud, but I still love it.
PSP- While it's the second console I ever traded back in, I regret buying this more than the Wii. The games itself are downright "meh" with very few exceptions. Only bought it because all my friends just loved Monster Hunter, but when I played it that game was just horrible. As for the features, everything it does, an iPod will do better. It's games library is just flooded with remakes, watered down ports, and games that just shouldn't exist. Only console this gen that I say shouldn't have existed.
Never played the DS. Don't really plan on it.
So yea, with the exception of the PSP, I think this is probably the best gen of consoles yet. By far, to be honest. There really is something for everyone. My personal tastes aside, I can still easily see the appeal of the wii. Hell, I play it with my friend at his house and have a fun enough time.