Solo comparison

[fadetree]

If there's room to kite, can be snared/rooted, and doesn't summon...a Ranger can kill it.
I would rank:
solo farming: Ranger > Monk > SK
solo exping: Monk > Ranger > SK
group tank: SK > Ranger = Monk
group dps/utility: Ranger > Monk > SK
raid tank: SK > Ranger = Monk
raid dps/Utility: Monk = Ranger > SK

Monk and Ranger is a hard comparison, depending on what you want and what the situation is the can go back and forth on which is 'better'. SK is much clearer. I think in groups Rangers 'stack' a little better than the other two.