i came here to complain about similar issues; starting with challenges, it's pretty easy to beat them but im betting they would be more fun if your score was ranked and people could see the top 5 ranked players on that challenge do them, then it stops being about beating the challenges themselves "which is pretty easy" and more about beating/chasing the players in the top5.
my next complaint is about drop items, why isn't this a bigger thing in the game? their are tons of spots people can go too to create skate spots, each person can drop items, a group of people in chat/party could get together and create their own skate parks! why isn't this common knowledge? also the "community" created skate park editor needs to be out as soon as possible, the skate parks now seem to be set up with the idea of groups of players skating them and dropping items to flesh them out, this should also be something people do around the map in all of those open areas, what incentive could be used to get people doing this?
i also have a issue with throw-downs, not the mechanic itself i think it's fine but s.k.a.t.e. needs to be added to it. imo we already have a form of death races, when people do the challenges that have you go to the rooftops and jump those huge ramps from building to building etc, i think that needs to be re-named and fleshed out to be death races/hall of meat. again with a ranking system and being able to watch the top5 players doing them so that the challenge will continue to be fresh.
also, chat needs to be added now. this game feels dead without it.