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I'm not sure how grass would be coming back up through rolled asphalt so soon. Without placing fault, you might have gotten what you paid for though. 2" of asphalt even on a compacted base will not last very long. It will break up with a car after a while. It is definitely not enough to do a business parking lot with all the traffic on them. You would be much better off having them put down another lift of 2" to 3". 4" is a minimum for a drive or parking with 5" to 6" even better especially if driving pickups, one-tons, and tractors on it. Streets generally start at 8" of asphalt with semis driving on them with up to 11" at intersections and we all know how not very long it takes for potholes to develop. Of course, the extra asphalt costs bookoo thousands of dollars more and most people try to get by on the cheap with a thin driveway. I personally would leave a parking lot or driveway in gravel unless I could afford 5" to 6" of concrete or asphalt with a preference to concrete. Even asphalt, just like highways, has to be resealed and even chip sealed every few years to maintain it since it will still crack and water will get underneath and then the freeze thaw cycle will create potholes. Most parking lots like Walmart are laid with at least 4" of asphalt. Every few years they have to come in to overlay everything or else have a rundown looking lot. Even then, they still develop potholes. Where the cars sit develop depressions around the tires. Then dripping oil from cars makes asphalt detererate more. Pour diesel on asphalt and the asphalt will just melt. I used to do some road construction and operated a paver among other equipment. We did the small parking lots when the state wouldn't let us do their roads because it was too wet or too cold to do it according to state or fed specs. Go figure.
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