I like it a lot. I use it for almost anything but if by some chance I need a break from the larger stance, I have the smaller controller. That being said that doesn't happen very often/I don't really find the bulkiness an issue.
Battery is a slight issue but A) you can keep it plugged in B) there's an extended battery available somewhere and C) as fun as the Wii U is I can't see myself playing for so long that the battery would be drained and I'd still want to keep playing lol, I don't have huge chunks of free time like that much anymore
Gamepad is great though and it's definitely what makes the Wii U so enjoyable to me. Instead of picking up a remote and a controller I just pick up the GamePad and while the TV starts up I can get ready on the GamePad. Off-TV play and easy headset use and don't even need the TV is great for people like me who only have one TV for all their gaming (I've got a Wii, Wii U, PS2, and PS3 all hooked up to the same TV).
I can also keep more bloody, violent, or loud games on the down-low (e.g. Call of Duty) so people in the house aren't disrupted or wondering what the heck I'm playing where people are swearing etc. constantly (which is a huge problem in my house, even though I'm 19 my parents still wouldn't approve of me playing most mature-rated games and definitely don't want to hear me doing it).
Honestly, sometimes I play the Wii U just because the GamePad is easier to use than the other systems, lol. It's more of a psychological thing than anything else (15 more seconds isn't a huge deal) but eh.
And it's supposed to be getting a quick boot option soon, which means even more convenience, lol.







