For what types of reptiles? There are ones specifically for snakes, or specifically for geckos. I find the general ones to be not that good..repticzone for example is a lot of 14 year old kids giving out advice on animals theyve never kept before, or just giving completely false information, etc
Try to find a forum specific to the animals you're interested in, I think you'll have a lot better experience and better opprotunity to learn. At least that's been my experience.
The generalized reptile forums are nothing but a bunch of immature imbeciles posturing and badmouthing about things they mostly have no clue about. Even though Kingsnake.com has specific forums devoted to specific creatures, I too would lump them into the above category. I've never had a good experience at Kingsucks.