Now, i know this sounds bad...but, Toyota has yet to prove that they can make a real-world tough work truck. The previous Tundra, for lack of better words, was a daisy among men. It was fairly reliable and comfy, but it was not equipped to do HD stuff. Don't get me wrong, i was trying to push my brother into getting one of the last '06 Tundra TRD because he only needs it for house duty (Home Depot stops, etc.), not for towing or heavy cargo.
If i was in the market for a new fullsize truck, then i would definitely wait a year or so before buying since all of them are 1st year models (except Ford). But, if Chevy, Ford, or Dodge do decent in reliability, then i would go with them over the new Tundra or any Asian truck. Three reasons: 1. Americans know how to build a rough-and-tough work truck...just check out your local construction site...how many American trucks do you see and how many Asian truck do you see; 2. Tundra's frame is still a big question for me. 3. No diesel is offered in any Tundra (yet).
If i was in the market for midsize truck, then i would go for Nissan Frontier. Frontier = all the goods of Tacoma but with fully-boxed frame and rear disc brakes!
Power is good and all, but i want a strong foundation. And remember, until recently, DOHC engines have not been favored in work trucks because of lack of low end torque and may not last as long as pushrod-design engines. (Of course, a true work truck should be diesel-powered IMHO.) The new Tundra has a bunch of high-whiz tech stuff (variable valve timing, etc.) which may close the gap (or even exceed?) in terms of low pulling power but only time will tell.