I haven't joined a roleplay group in quite a while, but I'd say that if I were only looking for a casual, spontaneous roleplay, I would be less inclined to join with a website. If it were a group I were to plan to associate myself with at a more frequent amount of time-- something more long-term--, I wouldn't have any problem with a sited rp, as I believe they can be fun and often provide plenty of essential info on the backstory or specific characters. ^^
