Also a druid does nowhere near the dps of a shaman and similar to a cleric. I'm not sure what game you are playing but I can regularly do ~700 dps on thade and druids top out at about 400. A cleric meleeing spends 0 mana and does almost 400 with NO cost to themselves.
My experiences are similar, just with lower numbers.
I used Uageru a ton when I played, averaged around 200 dps with him while I farmed stuff. This was with the cleric summoned hammer, 5 tomes of power, and the gear he has on now if you fomelo him. No haste item, not much (if any) crit/attack, no weapon mods, etc. I believe a cleric with ikkisith gear could hit 400 dps auto attacking.
I also used Josseff quite a bit, although his gear seems to have improved some on fomelo. When I played him, his gear was only a tiny bit better than Uag's. When 2boxing in first ruins, highkeep, RSM, Rust, etc. I did not typically maintain 200 dps, although I generally had a mana surplus if I was only healing, so I usually meleed and threw out an AE every so often. If focused on DPSing rather than healing, I could maintain more than 200 dps.
A cleric can put out their DPS with almost no impact on their healing potential. A druid that's solo healing a group is not going to be doing any significant damage unless the group outgears what they are killing.
Thade's numbers of Shaman=700, Druid=400, Cleric=400 are for the highest of high end. For the most part the relative DPS levels are pretty similar down through the tiers from what I've seen. But the fact that the cleric number is what they can do while also healing is a big bonus.