Jungle Fury so far. I watched all of Power Rangers Jungle Fury that's aired so far this week and I have to say, for me, this is the first decent (sometimes almost good) Power Rangers series since Dino Thunder.
Yes, the characterization and writing remain frustratingly inconsistent, but the Rangers (and just about everyone else) are so likeable that I'm willing to overlook those problems.
( Explosions! Wire fu! Spoilers! [Welcome to the Jungle - Ghost of a Chance] )