Finished watching Mutant X yesterday, and decided to watch the 3rd season of Torchwood out of the way. Can't remember much from seasons 1 and 2, but it seems that's not really required.
Where Mutant X was embarrassingly bad at times (read: all the time), Torchwood's final(?) season is the best so far. There was a lot of quirkiness in the show to begin with, but now it is very serious and dark in a way. Loving it!
Next I think I'll start watching Fringe...