I love my 4cl. I never underestimate my trucks engine. I rarely even look at the odometer. I keep it on my trip miles for my next oil change. That's all that really matters since the engine should last forver with the way I baby it. Yeah its not the fastest engine out there, but neither was the 22r! Toyota put the 2tr in these trucks for reason and still do. If they felt they made a wrong decision they wouldn't keep using them. They kept everything a truck would be used for in mind when they threw the 2tr in the engine compartment for the first time. Towing, hauling, driving uphill, if you don't like slow but steady, get the v6. If you want the better mpg, and a longer lasting- more reliable engine get over the fact that the 4 banger is not built for speed.
I baby my truck, too. That's probably why I don't think it's underpowered.