Fixed for HTML errors.
I look for what makes an established CDJ, which includes recent RP samples, taken/retired/available character list, past RPGs, wants & donotwants but most importantly information like if that person has a preference for good literacy, looking for plot and character development or if they only play fluff/PWP, RPGs and/or 1x1s, among other things.
A CDJ that's empty save for a dropbox, or only has a couple of posts detailing that you write ________ paragraphs long, you like these ______ pbs, you're in this timezone, and a casual '*shrug* yeah, I've RPed before' history description isn't going to lure anybody: not to mention that after reading it you still haven't learned anything about that RPer's style and interests.
The more information that's provided, the more helpful that CDJ is =)
I don't know what'd classify as too much info, but I think listing every single kink/whathaveyou might be a bit overbearing. Plus, posting every single RP post or application you've ever done.
That, and maybe if the PBs/icons take up more space than the actual relevant text. A CDJ that's dedicated to simply showing off your played&lookingfor PBs isn't helpful in contrast to a CDJ that has info on where and what you've played, etc.
It won't interest any non-PB RPers, nor does showing off your icons provide any help in what you actually enjoy writing about.
CDJs with adoptables, .gifs, etc are a major turn off, personally. It would not impress me in the slightest. I want to see RP history and tastes in text, not banners illustrating your RP style.
I organized my CDJ bonemeal with simple but efficient tables. Easy on the eyes, the colour scheme isn't blinding, and WYSIWYG. People (I hope) don't have to go digging just to find out what I will and won't play, what I have played but won't pick up again, or what my old RP haunts were.