Should I let this go preflop? This guy played lots of pots afair, so I didn't give him credit for a strong hand. I put him on a drawing hand after his CR, but it turned out he had absolutely nothing.

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (5 handed) from (Format: FlopTurnRiver)

UTG (t3940)
MP (t2400)
Button (t2895)
SB (t2000)
Hero (t2265)

Preflop: Hero is BB with K, T.
UTG raises to t300, 3 folds, Hero calls t150.

Flop: (t675) 3, 4, T (2 players)
Hero bets t300, UTG raises to t3640, Hero calls t1665 (All-In).

Turn: (t6280) 5 (2 players, 1 all-in)

River: (t6280) Q (2 players, 1 all-in)

Final Pot: t6280

Results in white below:
Hero has Ks Td (one pair, tens).
UTG has Qs 8c (one pair, queens).
Outcome: UTG wins t6280.

5-handed and you're getting 3:1 against a LAG/maniac -- no way in hell i'd fold. in fact, i might value-shove pf if i thought he was getting out of line.

anyway, as played, you got what you wanted in this hand and got sucked out on -- that's SnGs.