I find it interesting that people want a low bitterness beer for hot weather. I'm exactly the opposite. I find low bitterness beers cloying when it's hot. I recall when I was studying for my BJCP exam years ago and had to drink a Bud to study it. I decided to wait for a really hot day and enjoy it on my deck. It was so sweet I just couldn't get it down. This is not a value judgement, just an observation on varying tastes.
1. When I think of American Wheat, the last thing that comes to mind is "cloying" or "sweet". Possibly there could be a touch of grainy, maltiness to it, kind of a soft mouthfeel, but I would never describe it as sweet. I'd call it dry - but not necessarily "crisp", if that makes sense.
2. There are many reasons why I could never get a Bud down. ![Smiley :)](http://www.homebrewersassociation.org/forum/Smileys/default/smiley.gif)
If you think Leinenkugel when you think of American Wheat, then I totally get the cloying/sweet thing. But when properly made, I wouldn't necessarily consider this style a "low-bitterness" beer. If it's well made, then it has light malt flavors balanced with the right amount of hops. Bud is 12 IBU, and I don't think I'd ever brew anything other than a sour that low in IBU. Mid 20's is a good ballpark to my palate to balance out a beer in this kind of style without getting in the way of the malt.
And for me, it's the ester profile of AB products that keep me from enjoying them, not the sweetness. (FYI - it's not acetaldehyde, it is an ester from their yeast strain that gives Bud that "green apple" character). I can put down a couple of Coors or PBR's if I need to, but I am hard pressed to finish even one can of Bud or Bud Light.