I'm not one of those people who cares if something is changed. I just care if something entertains me or not. There are some revivals I don't like, but those two are fun, especially Ducktales. I don't love everything about it. I have some issues with season 3, I sometimes find the new versions of Webby and Dewey annoying, and there are characters I just despise like Penumbra and Goldie, but the show has so much good writing, funny moments, fantastic episodes, and a great new take on Darkwing Duck that sadly didn't get its own show. We would have had Jim Cummings back as Negaduck, though in this universe he'd literally be an evil Darkwing Duck with someone else being the new Darkwing. It could have been awesome. Also, Glomgold, Donald Duck, Gizmoduck, and Magica De Spell are utterly fantastic in this show and arguably far superior to the originals, particularly Gizmoduck who just has a fantastic arc throughout the series. Donald Duck has so many AMAZING moments too when the original show didn't even used him much. And the reboot gives us Della Duck on TV and she's really entertaining.
Looney Tunes Show is basically Seinfeld with Looney Tunes characters. It works. Not every episode is a winner but there are some great ones and its version of Lola is amazing. Some of the music videos and Road Runner shorts are really good too. I love how crazy some episodes get with Bugs and Daffy finding themselves in absolutely ridiculous situations that I did not see coming. That's another thing I like about the show, Daffy gets a lot of focus here. Since the Looney Tunes Back in Action movie the Looney Tunes universe has put more of a spotlight on Daffy and his relationship with Bugs. The recent movie The Day the Earth Blew Up also spotlights him quite a bit and is a bit of a throwback to old school Daffy.
Now stuff like Teen Titans Go, ThunderCats Roar, that new She-Ra show, and the live action Cowboy Bebop I won't even watch. And the less said about Kevin Smith's He-Man the better. Looney Tunes Show and Ducktales 2017 are some of the few revivals that actually don't suck.