I haven't watched the others, but yeah, Teen Titans Go was hard to get into because of nostalgia fever. After a few episodes I saw it for the new thing it is and not what it was, and yes, it fucking rocks.
That fandom nostalgia is a helluva drug. Mix it with updated norms and politics and you'll get 10,000 word essays on why purple-hair Dr. Sattler can't use a hyperdrive as a weapon because it'd make Star Wars unrealistic.
The best thing is that they're made by people who grew up on the same stuff. Like OK KO is this wild blend of Looney Tunes and 90s/early 2000s Shonen and I love it.