Mario Kart - Awesome
Mario Party - Jank
Paper Mario - Garbage
Mario & Luigi - Solid
Mario Golf - DLC
Mario Tennis - Empty
Mario Strikers - Benched
Mario Baseball/Sluggers - MIA
Mario Hoops - One&Done?
Mario & Sonic - Was never that great, but eh, still.
Luigi's Mansion - Great but glitchy
Captain Toad - Good new spin-off
They're just spin-offs right so who cares? I care! Paper Mario and Mario Party was my first Nintendo games ever and were a big part of the reason why I finally started picking up Nintendo systems last gen. I've enjoyed pretty much all Mario spin-offs at one point (except golf lel), many of them moreso than the mainline games, so it pains me to have to look at this list. A combination of bonehead design choices, the struggle with HD development, the strain of supporting two systems, and Wii U massively underperforming are to blame. Hopefully Nintendo can rectify this next generation where they shouldn't have any of those issues, none except their own foolishness of course!