The 2012 Toyota Tacoma is competitive with other mid-size trucks like the Nissan Frontier for interior space, but of course you'll be getting a considerably smaller cabin compared to full-size trucks.
With Regular Cab, Access Cab, and Double Cab models, shoppers have plenty of choice, and each interior layout suits a different purpose. Double Cab versions have the space for four adults (two kids in back for Access Cabs, which have smaller back doors and seating), but in any of the models, the rather skimpy, short and flat seats in front won't win you over for longer trips.
Refinement--especially to those who are moving down in size even from a modest full-size truck--could be the Tacoma's biggest failing. From inside the cabin, both engines are louder than you might expect, and the ride can be choppy or jittery over some surfaces. But the cabin does feel durable, with solid-feeling Toyota switchgear throughout and chunky climate controls that would be easy to grip with icy or gloved hands.
That said, road noise is reasonably well filtered-out, and various test vehicles over the years have felt tight and been free of rattles. The cargo bed in the Tacoma remains made of a composite material that's lighter than steel and corrosion-resistant.