Dealing with Caster mobs

[eqravenprince]

I am a level 48 Monk and anymore I simply avoid all casters while soloing unless they are a green con and if they just turned green can be problematic. Is it normal for Monks to have some Magic Resistance gear? Reason I ask is because I feel like I might be doing something wrong. I was unable to kill the light blue con Shaman that is the placeholder for Shin Lord in Upper Guk last night, even with full health and using mend. He hit me with 2 nukes and 2 dots and healed himself probably 7 times before I had to feign death. As I left the zone, I announed Shin Lord camp was open because I was unable to kill the damn Shaman. I got heckled quite a bit, my favorite comment was "He is special...", oh and some level 40 Mage said "I can kill him easily". So I'm just wondering if there is anything I can do besides more MR, better weapon, and adding haste.

I am not one of those twinked out Monks, I've earned everything I have, including knowledge of how to play a Monk since I never have played one until P99. I have mostly Wu's armor or something similar, Wu's Quivering Staff, some +55 hp rings. But no added MR. I would hate to go buy MR stuff and find out it really doesn't make a difference. I don't have much money as it is, only 2.5kpp saved up. Any advice would be appreciated.