IMO 3D platformers aren't very fun most of the time, even when done by very talented people. Aside from Nintendo stuff...there are very few.
Could a homebrew team even begin to deliver something as good as Sonic Adventure 2, a game I consider barely playable due to the amount of time the player spends staring at a wall and swearing at the camera?
It seems like 3D platformers are really f*cking hard to make.
The problem is the cameras. Dreamcast lacks a way to rotate the camera, aside from either shitty face button controls, or trigger usage.
You could do something that's 3D graphics, with fixed 2D levels and environments, and it would probably be pretty fun.
Like Crash Bandicoot did. or a hopped up Tomba.
that would be pretty interesting, but it seems like all people want are shmups