if you have hands and gear you can farm with any class you want. w/o hand you can join any top clan and they can feed you like raxor or dontcry. or other "hiros" ))
there is no such class... wynn is probably least gear dependant class, but i doubt you will kill anyone before 97+ at least and some defensive stats (pdef resists mdef). also you will still likely lose vs decent tyrrs, daggers, archers...
wynn . stacked it wins tyrr+dagger which are hard without gear, normally stacked it wins any class besides good tyrr+dagger.
simply healer. good armor + reflect damage augment (even better if active + passive) and you win all.
no, in theory u cant win wynn as healer. another story is that 95% cant play wynn but dont speak about it...
farming class? dafuq is that? get decent gear and skills and u can be hero. other than that its just our pure luck that half the server are handless noobs who stack amazing gear (ahem....longing talisman...ahem) and still lose to a tyrr with twilight, apo weapon +1, 0 good jewels and no dyes whatsoever in his early 90s.
wynn summoners have always been safe choice for anyone who likes oly farm,isnt born with extra chromosome and doesnt freak out when they have to push more than 4 buttons. if you are stacked you might look into feoh,especially with new update comming out.