[soah]

With only one player to act behind him, MP3 could be betting worse hands here as a bluff, semi-bluff, protection, or some combination of bluffing/protection (betting a ten or a pocket pair which he presumes is good). I think that against many opponents your hand will be good here often enough to be worth continuing with. Furthermore, you have position over him in a small pot. Playing your hand aggressively puts a ton of pressure on him. It will be tough to call a big bet on the turn even with some hands that beat you (AJ, etc). Since he is seeing 60% of flops he will more often just hold an ace or ten here than a set. AA and AK are hands he'd almost certainly raise preflop, perhaps TT and AQ as well.

Even if your read on him (tight postflop) turns out to be wrong, you still will end up splitting 1/3 of the time if he calls down with Ad8d or whatever.