at these limits i don't think it's terrible to flat flop. a lot of players are scared by monotone flops, but the fear diminishes on each street. a raise will very very often fold out anything but sets and maybe two pairs. even if the board pairs on the turn you're still in betting mode 'cause you've only let 7 hands suck out on you. not saying it's the best available play but depending on the opponent (how often he'll bet the turn w ATC and so forth), there is a line of thought that could support the play.

the turn flat IS terrible. the bet is <1/2 PSB, which isn't getting you nearly enough value. i'm raising this and stacking off w a smile on my face. the 7 hands that beat you are VASTLY outnumbered by all the two diamond/two pair/trips garbage that you dominate considering it's a limped pot

edit: oops, there are 19 hands that could have you beat with the two pairs sucking out on you. the more hands like Q7 and 97 you're willing to add to his range, though, the more garbage trips we can add to his range, so i'm still stacking off here