edit: oops, I am late ^^^. This goes a long way to show how bad rake is!
Break even equity = pot odds (not taking rake into account).
It's a good exercise to calculate the break even equity when the pot is raked. Refer to the "analyzing calling an all-in" thread, all the math you need to do that is in there.
If he has JJ-TT,44,AJs,AJo then the call is pretty much break even (not taking rake into account), so it is slightly -EV after rake. But just a few draws in his range and it's a call.