I used to. It was a lot of my childhood. I had no idea it wasn't popular, I think I unknowingly made it popular with the elementary school I went to, because many followed me in buying it after visiting me. The games I played the most were Sunshine, Melee, and SAB2. But I had over 60 games because my dad would buy me 1 every weekend for an entire school year. To this day I would rank the Gamecube as one of Nintendo's best consoles. (in accordance to the decade each console/handheld belongs to).
I find it strange actually that there's people here who find Sunshine to be mediocre or bad, as a kid that game was countless fun for me, I probably replayed it all the way through over 5 times. And often treated it as an open world sandbox to goof around in on my 100%'d main file 1. Ultimately it was the way Mario maneuvers with F.L.U.D.D that I loved so much about it, similarly of my love to SMW and the feather cape. To this day I find those are Mario's 2 best powers so far (excluding spin-offs).