SPARROW RACING!!! (And maybe a Warthog-type vehicle)
Straying away from the usual complaining, I'm surprised there's no Sparrow Racing playlist with the amount of potential race tracks on all the planets. I think plopping some checkpoints for us to follow would be a fairly easy update. Adding in a Warthog-type vehicle is wishful thinking I guess but I think it'd add a lot more to the co-op experience in or out of the races.
Please Bungie you took our soccer/foot ball but this would make me forget about it entirely.