I much prefer manga but let's see what I get off the top on my head...
Very old school
Space Battleship Yamato (Series 1)
Captain Harlock (Series 1)
"Macross" (Really it's just old dumb Robotech)
Old school
Akira
Dragonball Z (Japanese version)
Totoro (And pretty much anything from Miyazaki's's golden era)
Grave of the Fireflies (Which I refuse to watch again)
War in the Pocket (The rest of Gundam pales in comparison)
This century
Aggretsuko (Ever have a job? Then you can relate)
There are bunch of series that I enjoyed enough that I didn't regret watching, but I didn't enjoy them enough to put in the effort in seeing in full. So...
Honorable mentions to hit the target number
Konosuba (Funny with great VAs but wears out its welcome)
One Punch Man (Concept and writing not as strong as Saitama but Mumen Rider is a king)
Sailor Moon (As repetitive as Power Rangers)
Great Teacher Onizuka (Repetitive as well)
Urusei Yatsura (Could be very funny but aged poorly)
Dirty Pair (More for the design tone and vibe than for any solid episodes)