Thanks to all for the replies.

You're right, it's hands like smaller pairs, and big suited connectors, KJs, QJs, etc. (the ones you wouldn't re-raise with) that are in this situation. I also just noticed that this only appears in the recomendation for *loose* tables. I'm assuming this is because the raising standards on a loose table are going to be weak. This is starting to make more sense to me.

As for the other question, so is it safe to say that if I limp in and get raised, I should pretty much always call (at least) unless it comes 3 bets to me?

If it does get raised and re-raised behind me, should I ever just call? Or should I only play hands worthy of capping?