The Americans also has the advantage of being done. It's six seasons long and, imho, manages to the stick the landing.
Two short seasons down, it's tight, it's sharp, it could go far.
As a fellow The Shield-lover, I highly recommend you try to finish The Americans.
Btw, funny enough, on rewatches, I actually focus more on the one big Stan question that isn't answered (and, in fact, is actually asked to him for the first time). I'm happy it was never resolved, though I keep wondering if there's some clue that they are hiding in there that will resolve it for real one of these days :)
That last part is the miracle. So many shows start out strong, and are just dogshit for the finale. Does anyone really believe that Severance will manage this trick? Would love to be surprised and mistaken, but they're just throwing crap at the wall to see what will stick, and that only lasts so long.