I don’t think FH5 had a story. Well, the story is, Forza Horizon is a racing celebration (held annually?) and you’re doing races and other activities to entertain the locals.

I think it’s a matter of whether or not you like the driving.

Mario Kart doesn’t have a story either, and I think it’s the most successful racing franchise? Seems like it would be. Certainly the oldest still around, going back to the Super NES.