Most people are used to the arcadey racers, so a sim racer like this will suck to them. People used to sim racers on the PC will be limited because of the dpad and buttons as opposed analog control. Veteran gamers like myself should be able to cope with the controls pretty well, since we've played many racers with digital controls back in the day. I think the DS version of GRID found a good balance between arcade and sim play-mechanics for the DS. Makes it a unique experience.....if you got the skillz to play it.
All-in-all, I'd say GRID DS is a great game for fans of sim racers. It's about as good as it's gonna get on the DS. To expect them to squeeze much more out of the little DS is pretty noobish.
I gave it a 9 on this thread's ratings.
I'll have to check out the NFS Pro Street game.....lotta people praising it....hmm....most of the DS NFS games left A LOT to be desired as far as I was concerned. I never give them a more than a cursory glance anymore. I'll have to give Pro Street another go.