Defense is a team concept. Let's see Love on a real team, with a shot to win something, before we say he's just useless on defense. He plays in Minnesota ffs, there have been other examples given in this thread about guys who didn't play defense, then went to a team where defense was accentuated, and they played fine defense.
Also, why are we acting as if the Cavs are giving up this defensive monster and replacing him with Love. They are giving away a rookie, who hasn't played ONE minute in the NBA....how does anyone know how he's going to look on the defensive end? I can't believe we're honestly debating if the Cavs should trade a rookie who hasn't played a minute (with unreal potential) and a 2nd year player who was a #1 overall pick last year and disappointed greatly (but does look better thus far this summer) for a legitimate NBA double-double guy who is also top 5 or 10 in the league...and he's only 25!!!
This is a no-brainer for the Cavs, it's the type of deal that if you don't make it as the GM, you deserve to be fired for incompetency.