Eldritch_Lord
Adventurer
Your statement is predicated upon the assumption that the OP will handle this poorly.
You said to "play a druid and show them how it's done" and the OP said his DM probably wouldn't appreciate another druid in the group; the part about telling the other druids that they suck was exaggeration for effect, but either way "showing them how it's done" doesn't exactly sound like the OP's just going to sit down with the other druids and give some nice helpful pointers on spell and feat selection. Even if he's not going out of his way to point out that they're doing it wrong, the other players will most likely notice that the OP's druid is tanking effectively and that theirs aren't effective at all, and outdoing a bunch of newbies with their own class is less desirable than playing something else and helping them learn to improve their characters.