Well, the conventional wisdom is that in a 3bet pot you can sometimes check when you would otherwise bet for pot control and sometimes bet smaller and accomplish the same folds without risking more chips. Bet size can also generally be smaller on a dry flop. The flop is paired and rainbow (which is dry) and connected around medium cards which is wet in a raised pot, but semi-dry in a 3bet pot (people unlikely to 3bet or call 3bets with T8)

In other words - coming into the flop I would expect any bet to be around 1/2 pot or so. The straightforward interpretation of a full pot size bet is that he wants us to fold. If he felt good about his hand and wanted to extract value he'd almost certainly have chosen a different bet size (because he wants us to call and the flop is unlikely to have improved our hand). The question I then ask myself is - given that he wants me to fold, do I feel good about the strength of my hand?

I know I didn't actually say the words hand range in the above, but it ties in closely with ranges. What range of hands is he betting small with (hands that want to get called - strong hands betting for value) - what range of hands is he betting big with (AK, TT, JJ type hands that are strong but vulnerable and would prefer to see the fold and not be put to the test).

It's really poor thinking on villain's part. If this is how he plays 3bet pots he would be better off folding TT preflop to a 3bet. I'm not much better myself. I think given opponents situation here I'd probably plan to bet/fold, check/fold, check/fold with the bet on the flop being 1/2 PSB. Check/call with TT in a 3bet pot seems suicidal. With TT we have showdown value but can't bet for value very often.