With 5 people seeing the flop someone will hit something.
If it was you + 1 or 2 limpers and you had position on them then its fine to bet 1/2-2/3 of the pot, you may win the hand right there, and if not you have 6 outs to improve. If you are reraised then fold ofcourse.
With 5 people in the pot even TPTK is not a safe hand