Favourites on right now? I watch A LOT of tv (I work weird hours) so I have quite a few. I'll narrow it down to shows currently airing, not on breaks or waiting for the next season.
Better Call Saul: It's so good to be back in the Breaking Bad universe. It's like re-growing a missing limb.
Broad City: Legitimately hysterical. A show about 2 girls in New York that doesn't pretend that everybody is rich, straight and white. Also hilarious. Just super funny.
It's Always Sunny in Philadelphia: Just magical.
The Flash: It's just doing everything right. Great cast, great action, great FUN. It doesn't feature Wally West (my favourite superhero, let alone favourite Flash) but it's still awesome. Arrow's pretty great too.
Parks and Recreation: I am going to weep, openly, in public for days when this ends next week. I've loved it for so long.
And for a current show that's only on in Britain: Cucumber. This show is great. A really good, contemporary drama that happens to be about LGBT individuals. It's not token LGBT either, they're all human beings, who happen to be... whoever they identify with. It'd be brilliant if they were straight, aliens, Horses, whatever. The companion show; Banana is... ok. Pretty much just Skins (I'm not as up to date with this as Cucumber, so it may change later on)