Good idea for a game, The time limit thing that people complain about I can understand, by rights you should be able to follow the speed limit (apparently 35, although I've seen vehicles doing 50 on the freeways) and make it with a few minutes to spare. - It's unrealistic to have to hit 75 MP/H as a constant while everyone else is doing 35, this can be easily remedied (in theory) by changing the speed limits of other vehicles, thus making the traffic flow and your own speed seem normal (you might only be doing 5mp/h more than general traffic instead of a huge 20+ mp/h)
I've heard complaints about AI, and some of the stuff I've seen on the road so far has looked pretty funny, but some moments of note are on an excavator delivery to Los Angeles I saw the police chasing a pizza car with his passenger side door smashed wide open, and another 2 police cars chasing one of the rigs I was racing against.
I've seen what looked like a decent car accident where both drivers ended up on the side of the road, unfortunately due to the limitations of the AI they end up driving again instead of being picked up by a
tow truck 
.
I was also really hoping we'd have suburbs, and that the cop enforcement would be more developed, I'd love to be able to skip through a suburb to cut some time or dodge heavy traffic congestion - but at night time I'd get fined for noise disturbance if I used my Jakebrake in those areas.
I've also had a strange bug with some of the other rigs, when overtaking them I notice I can see the driver (the back of the truck didn't load / is missing) inside the truck, it's quite an odd look and if I've managed to catch while frapsing I'll post a pic soon.
I'd rather the truck racing be more developed as it's own thing I think, and have regular delivers like usual (sim side of the game) and then a monthly race-meet that everyone is working towards - where we spend all our spare hard earned cash, maybe even have a special custom racing rig that you get to spend your spare profit on. - But I haven't done much racing ingame yet so I'm not actually complaining about it
Another cool idea would be CB radio chat with other players - it might be a singleplayer game but it'd still be cool to talk to mates playing the game and commenting on how we're doing
.
I'll give this game 7.5 out of 10 for now, there are some bugs and funniness, but I've come from playing ArmA II which was buggy as hell, the developers really are making that game better and better everyday, so I have confidence Rig'n'Roll will be just as great.