I wouldn't go so far as to say that rescue should be removed, but it absolute can and does get used to harass other players, and it does have some usability issues aside from it. I've seen rescue abused or misused more often than I've seen it used correctly. Twice I've experienced a healer, each time in an alliance raid for some reason, deciding they wanted to try and get me killed in an AOE by rescuing me into it. Aside from that I've had failed rescues happen more than a rescue that's actually helped me. Which is likely due to the server not registering your new location until after the rescue yank animation plays out. Then again, that delay actually saved me from dying one of those times where a healer was trying to kill me with it, so I guess I can't be too critical about it.