Welcome welcome, a hundred welcomes!
"That's not interactive, there's no back-and-forth with the other player and how much fun is it to watch someone incredibly good at moving their eyes? And then whichever Seeker gets lucky swoops in and grabs the Snitch and makes everyone else's work moot. It's like someone took a real game and grafted on this pointless extra position just so that you could be the Most Important Player without needing to really get involved or learn the rest of it. Who was the first Seeker, the King's idiot son who wanted to play Quidditch but couldn't understand the rules?" Actually, now that Harry thought about it, that seemed like a surprisingly good hypothesis. Put him on a broomstick and tell him to catch the shiny thing...
When I first got here, every RP was up in like 50 pages, or something, and being the horribly lazy easily intimidated person I am, I was just sitting around waiting for a new one to start that I could sign up with.
That is, until Idran decided I should join his game. :<
Anyway, what I'm saying is, you don't need to read the whole backlog of a game if you don't want to. Usually you can get a summary from the GM in question, or stuff. New characters pop up all the time, so it'd make sense that they don't know every little detail about what's happened before their arrival.
So don't be scared, be... uh... prepared?