I play this type of hand a lot, so I don't see preflop as a bad call. The only mistake I see is not raising the flop. You flopped a vulnerable nut str8, and notice that BB got to stay in for one SB? If your going to play a mediocre hand, you have to jam the pot when it hits. What were your thoughts for just calling? BB may not have folded, but when players make mistakes like that, make their mistakes expensive.