First one, AWESOME! 2nd one was decent but its so overplayed on the Television, I believe that's why I hate it more than the others. Tokyo drift was unique, I like the addition of drifting and the music was stuck in my head for like a month, so props for that, LOL. The last one was freaking bad-ass, hands down and brought back the rush and adrenaline of the first one so at least this shows there going back in the right direction and it shows they can keep a series alive and kicking longer than most. I mean if they can make 4 that all score acceptionally well in the box office and in my eyes at least, I don't see why the 5th wont be worth the watch.
Should some series stop while there behind? (Spiderman) Yes!
Is Fast and the Furious one of those? I think not!