Quite right, we're in the middle of a surprisingly warm "Indian Summer," but on average the weather isn't much different compared to the majority of England or (Northern) Germany. We do get quite a lot of snow, more here on the West side of the State as compared to the East side (where Joey is), and my guess is that roads aren't maintained nearly as well here as they are in parts of the Detroit/Ann Arbor area.
...That being said, the roads aren't too bad out here, you just have to know where to go. Given that Grand Rapids is built on a grid and much of the area outside of town is in fact farm land, the road will be straight and flat for miles, and miles, and miles, and miles.
However, being blessed with the Grand River valley near my home, there are several roads that are quite fun to blast up and down from time to time (even in the Jetta). They are by no means as beautiful or complex as those seen in the Episode of Top Gear, but being Michigan and all, they are quite nice... Rolling hills, some tight and smooth corners, plenty of room to get up to speed and have to really slam the brakes on. If it were not for my bicycle racing I would have never discovered these roads, but its a damn shame they're being developed now, a bit too much traffic at times to get done what needs to get done.
If you're ever in Grand Rapids (I doubt you ever would be), Grand River Drive and Honey Creek, as well as a small portion of Pettis are all great drives. I've always thought it would be awesome to have some kind of road rally out on those three roads since they all dump-out at the same places (all ends meet on two major roads), but the trees are likely too close to the road, and two-lanes doesn't necessarily facilitate the best conditions... Not to mention the poor condition of the pavement from time-to-time.
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So yes, the Aston?
I could handle it. I like being hot, the difference here is that I'd dress properly before getting into the car; You know, shorts and breathable material pants/shirts to wick the sweat away...