Yo russff. In this case, there are only 2 people playing, no more no less. Naturally, the strength of any pocket pair depends on how many people are calling/raising. KK pre-flop against one caller is much stronger than AA pre-flop against 8 callers. 22 is a terribly weak pocket pair but if that third 2 hits the flop, you're now sitting at the table atop an invisible nuclear weapon.
I guess in a nutshell, you should never assume that any 2 cards are "good" or "bad". Certainly some look better initially but it all comes down to how they fit the flop and how they are played against.
Btw, I don't necessarily think you meant it so literally but I would avoid saying (and definately thinking) that anything 'never happens" or 'happens all the time' unless I'm using that to falsely advertise myself as being a weak player. One of my favorite poker sayings is that over the course of a lifetime, we all get the same cards. There's only 52 you know
