Actually, I've drawn up a pretty good list of ideas for a ranger revamp. (Granted, I've drawn up a pretty good list of ideas for new abilities for a lot of things.) If I was a little more active right now I'd probably start work on that project.

That said, I don't at all think rangers are weak right now, even at the high levels -- just, not especially varied or interesting in their tactics compared to some of the other classes.