I think your overstating Druids charming capabilities. Solb bats for instance won't even be viable till late 40s/almost 50. There are far less charmable animals (especially in accessible zones or zones with good zem) than charmable undead..
And assuming any situation the druid is not charming, a shaman would be far preferable.
At 2 hastened charm pets alone will tear through just about anything they face as will a necro pet, charm pet and a single shm dot (or doggy). So really the issue isn't about adding dps but added utility.
A druid will bring thorns and ports.
A shaman will bring better slows, mana regen, and most importantly malo (for those charmed pets).
I don't think anyone is denying that a Druid would be a good trip partner but overall (outdoor, indoor, level 1-60), a shaman or cleric will end up being more effective.
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