It's probably down to the fact that the "top" teams are performing nowhere near as consistent as they should be. I mean, Man U losing to two newly-promoted teams in successive games? That was never heard of before I don't think. (Probably had happened at one point but you get my gist.)
Couple that with Chelsea completely choking on their ambitions, Liverpool a total flop, and Man City, Spurs and Arsenal all having a wobble every now and then, no wonder top place is currently occupied by a club outside the "top six".
I have always found the Premier League a more boring competition than the Football League overall. Perhaps not having promotion to fight for and the "top six" having much bigger resources both having something to do with it.