Tundra's are a minority here, at least newer ones. I recently bought a 2010 Crewmax and so far I have no complaints but I've only had it a few months and 4000 miles. The motor is a pure joy to drive, gas mileage for me is 13-16 range, but its hard to keep my foot out of it. I'm coming off of 5 years in a 96 80-Series Land Cruiser (11 mpg) that had a moderate build, sold that for a 08 Tacoma 4-door w/TRD supercharger (17 mpg) that was my next planned build. The taco just didn't do it for me so after a year I traded it in on a Tundra.
The major issue is always the sheer size, it takes some getting used to driving such a big vehicle, and there is no way to overcome a situation where your vehicle is simply too large to navigate a section. My reality was I rarely used all the capability the 80 series had to offer, and I'm not trying to seek out tight trails. There is usually an alternate line, and I'm sure there will be times/places I simply won't go due to width.
I like to cover a lot of ground on road trips, multi-state, access paved and dirt, explore some rougher dirt, drive on sand beaches, travel in blizzards to go skiing, and carry 4 adults with toys in comfort. Tundra does that beautifully. In stock form the ground clearance up front is a bit marginal, so I just put on the 2.5 Old Man Emu suspension, Light Racing UCAs, Dakar leaves and Slee sliders. Waiting on three BudBuilt skids to arrive. I think the mild lift, skids/sliders and eventually bumpers/winch will make the otherwise stock Tundra a very competent overloading style truck. The 5.7 should handle all the extra build weight with no trouble.
Durability should not be an issue at all, after 5 years with the 80 series (sold it with 198,000 miles) I love not having to wrench anything. I had a love/hate relationship with my birfs. On the other hand, lots of electronics on the Tundy which only time will tell how they hold up. Traction control has been really amazing, the truck doesn't step out on wet pavement and works really well in snow. I'm still on stock tires although not for long. The electronics are the only reason the stock tires can work reasonably well, I still don't fully comprehend how they can keep 380 HP manageable and so flat out fun to drive.
4 low is really low, or at least seems to be compared my previous vehicles. I've played with it but so far 4 hi with the traction widgets does very well at low speeds.
I wish it had a bigger gas tank, although it matches up well with my bladder and you can carry plenty of jerry cans in the bed if you are really heading off the grid. 325 mile range seems to be my average.
I went for a Platinum so the interior is pretty much one of the most comfortable places in my world to be, which also facilitates the idea of "Hey, let's grab a few days and jump in the Tundra and drive to ............." Which is pretty much the real reason we play with these rigs in the first place.
Mine has 20 inch wheels which aren't my first choice but I haven't decided which way to go yet.
Test drive a few and tell us what you think?