(in no particular order)
Game of Thrones - outside of the last season, this was outstanding
Better Call Saul - knee jerk says this is on course to rival BB
Rick and Morty - I really hope this can maintain the quality
Black Mirror - I LOVE this show, very rare missteps are even good
Watchmen - it only just started, but damn if this isn't a masterpiece already
This Is Us - can't help it, this is great
Mindhunter - love the characters, love the subject matter
Ozark - very similar to BB, but I find myself wanting to watch the next season yesterday
Stranger Things - doesn't everyone love this?
Agents of SHIELD - no, it hasn't always been good, but when it is good, it's absolutely fantastic (watch S4 and tell me it isn't great)

Just missed it...
True Detective - I even liked S2, still haven't seen S3, but S1 is awesome
The Mandalorian - brand new, but the best Star Wars has been in a very long time

As for the overrated...
Westworld - I don't hate it, but it is NOT the 2nd coming of GoT like HBO hoped
Stranger Things - yep, it's on both lists... it's good of course, but people salivate over this like it's among the best ever... I'm not going that far