I've only recently started to play around with these skills half-seriously as of late and I'd like to hear back from some people who regularly USE them--not just have them.
First up, is my upper level cleric who has maybe 2 ranks of Diplo and a diplo item. On a lark I tried in a low-bie GH quest. A mob came towards me and I Diploed. Two ogres, two trolls, and minotaur turned their back right on me. Coincidence? I just remember saying, "Cooooool." Of course 2 ranks and an item at upper levels might not get me much, so...
I started with Diplo also on my rogue. Then realized that there seemed to be more Bluff items for a rogue than Diplo (in my own casual perusal). I can't say I've had much success with either, even though my items and ranks probably exceed my higher level cleric's. I'm not thrilled with Bluff. My elven rogue seems to do this effeminate diva-like / jedi mind trick wave to "bluff." Not exactly something I'm hoping to become legendary for...
Lastly, with my ranger, I decided to go with intimidate. Why? For some reason I felt I wanted/needed aggro. Not sure if this is the brightest move in Eberron.
So for my questions:
What can't be diploed? (I imagine constructs, oozes, and undead).
How exactly does it work? From what I've read I'm confused if I must target a critter or if it is an AoE.
Bluff -- Same questions as above.
Initimidate -- Is it wise to have a ranger with intimidate?
One other thing I'm worried about is when I diplo/bluff a critter aren't I just sending mobs at some other poor S.O.B? Anyone ever been slaughtered by a diplo/bluffed mob?
From what I read, these skills are vital for a cleric (diplo) or a rogue (bluff). Curious to hear the pros and cons of these. Thanks.