Tough topic. When I'm trying to decide whether to call w a bluff catcher online, here are the things I think about:
1. Given the preflop action, what range of hands should he have? In a limped pot it's obviously harder to do this, but if he raised UTG it should be a little easier.
2. Given the actions on each street, is the story he told about his hand consistent? Does it make sense?
3. Does he look like a spazz?
4. Is he super passive postflop and just shoved all in on the river?
At microstakes, we make most of our money value betting and stealing, not by bluff catching. So in general I'm inclined to let those strong-ish hands go in the face of action, esp from a passive player.
But if the story they're telling throughout the course of the hand doesn't make any sense...