I admire your use of periods, but condemn your lack of shift key.
if the shaman is elemental i would focus fire(mana burn) him until dead or oom effecively the same thing.
sure hes not as squishie as other targets with around 10k armor, 200+resillence but he can put a crap ton of burst damage with spot healing if left alone.
if he is resto speced have the lock stick his felhunter on him to eat the nasty earth sheild if you plan on dpsing him. if he is part of 2 healer 3 dps team, sheep the other healer, curse of tongues the sham and just Counterspell him.
if he is resto with another elem sham, focus the elem sham, sheep other healer(if there is one) and just counterspell the resto one.
you rarely find one in the higher level teams,but rogues beat the ever living crap outta non resto shaman.