Yeah, it's Sonic 06.
I feel like Sonic's story can be fun if played in an emulator which drastically fixes the load times and slow down, but on actual hardware? Good lord.
Silver's story isn't awful, just really boring and dull overall, why they thought to make him so slow I have no idea. He was so close to being an incredibly interesting and likable character but sadly got done very dirty. Blaze is really fun to play as, though.
And then there's Shadow's story; it's awful. There's no way around it, the gameplay in his levels just is not fun, having to use clunky vehicles and search for keys as Rouge with no radar, it's the franchise at its absolute lowest.

Sonic 06 isn't an abysmal game despite this, it has a lot of redeeming qualities I feel and the story is genuinely interesting despite its major problems. This game is an intriguing case study of how a franchise can fall and become a disjointed shell of its former self, yet despite that have so much strange charm to it all.

Felt like going back to this game as I just yesterday came out as a trans woman and am now going by the name Emily!
This is a really interesting experience of a game, telling a very sad but real story of two people drifting apart overtime which it does a wonderful job portraying through a recreation of AOL Instant Messenger.
While the sequels are more fleshed out and layered experiences, this original game tells such a compelling and memorable little story that it always sticks out in my mind many years later.