Invisibility is flat-out broken. You can walk up until you are threatened, go invisible, and not move thereafter. The enemy never attacks, never uses opportunity attacks, and, unless there is another force at work, never moves.
To be briefly fair on one small point - it is correct that things don't take OAs on invisible creatures. The OA as written requires it to be against a creature you can see.
Not disagreeing that stealth in general is a broken abusable mess right now.
