I started with a necro a druid and a shaman, so far for me the druid has been the most fun, but I usually go solo around exploring due to being afk at odd intervals.
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If you want to group shaman is very good! But has the versatility of being able to solo too.
I see mid level shamans soloing all the time, rooting then dotting guards haha.
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Depends on what you want to do too.