I think it peaked at Super Mario World, with the snes.
The following "new" titles of super mario bro's hasn't been up to the same level (or maybe im just old and jaded).
New Super Mario Bros. 2 + New Super Luigi U feel especially bad imo.
Its like nintendo doesnt care to put in the effort in these games anymore.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071