I think it really depends on what kind of shows/fandoms you like. I mean if you absolutely hate 'High School Musical' then 'Glee' probably isn't for you (although it's different in a lot of ways and is obviously more adult) but if you like musicals and general teen dramas then you'll probably like it. Personally I'd give it a 7 but I definitely don't see the harm in waiting until it airs to see whether you like it or not. :)