"They still change things up to where it’s really not "superficial rehashes" like you say."
You could claim the same thing about 80-90% of the platformers from the 80s and 90s.
"One can build on the old and still make a good game"
When did I say you can't? That'd describe most of my favs; my point is that many of Mario's recent games don't even do that much.
"hell they change things up more then CoD does for most of it’s games."
…even if that were true, that's a pretty damn low standard anyways…
"Hell changing thing too much is actually a problem with the Sonic games, they Mario games ARE Mario games as they keep the core gameplay."
Oh what, so all of Sonic's games should play like the Genesis games? It's not like every game is from a different genre; the vast majority of them are still fast-paced action games where you play a hedgehog that can spindash through robots and must get from point A to point B. Seriously, what more is there to the core gameplay than that?
"Oh yes, the spin-off, even the one that are not a rehashes because they do not have the same gameplay, ya they are rehashes."
…maybe not a rehash of the main games, but Mario Party 65, Mario Kart 500, Mario Tennis 2017, Paper Mario and Luigi: The Thousand Year Saga and Super Smash Bros.: The Only Legitimate Alternative to the Hyper Street Fighter 9001 Turbo: DLC Edition aren't exactly original either.