I just wanted to say Thankyou to many of the contributors to this thread. I haven't laughed so hard in a long, long time so Thankyou, thankyou, thankyou.
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From the OP's confusion about 'damage dealer' and 'tank' through to the "considered opinion" that Rangers are "weak", "sub-par" or one-trick-ponies.
It's hysterical!
Just because Perma-Sin/RoJ is flavour of the month, doesn't detract from ANY professions capabilities and the Ranger's boon is his/her flexibility. Barrage Shmarrage! - show me a SB build and I'll show you a Ranger who really isn't trying hard enough.
Ooof! I think I popped a rib!!
If you're confused about your role, then let me spell it out - target squishies, call targets and spike them into oblivion. If you're damage output is crap then you're doing it wrong!