And about the jump/disengage, if you do feel it´s an exploit you could just avoid using the jump. Why do you want to deny your party members or players that like it the possibility to use it? It´s a party-based game, not a competitive-PVP game.
Sometimes when people complain about exploits, I say "just don't use them". There are other things which are just so strong and/or so useful that they warp the balance of everything else. This is the "warp the balance" one. Maximuus's post clearly demonstrates why: enemies don't use this, and if they did, players would not be happy - especially players of melee classes.
