Well, the type of opponent is that which will call with anything, but not invest much money with anything.
Say you raise with a jamming hand such as AK, one or two Mr.CalllWithAnything's enter the pot and you get a boards like 268 (which seems to happen an enormous amount of the time when you have only A high).
Now on any occasion whereby a high card surfaces (AK or Q), they'll drop their cards instantly, but anywhere else, they'll insist on calling anything and then proceding to make to make teensy probe bets resulting in an eventual proper bet on the river, but this bet could mean anything - total bluff or bottom pair bottom kicker.
Yes, people value bet bottom pair, bottom kicker on the river when in position and it has been checked to them...or is it supposed to be a bluff bet? I can't tell, but it could be either, since I've made the calldown in each situation. (And of course, I never see anyone again twice unless they're playing a standard strategy, making them somewhat more predictable).
Okay, so you raise with high cards, completely miss the flop, but any person playing rationally would also have missed such a flop, but you know the person you're in the pot with will call at least one bet if not two regardless of what they have, or make tiny bets if you check, followed by a large raise or bet on the river.
Check/Fold?