New answers tagged malt
With just sugar, you wouldn't be making beer, since malted grain is a key ingredient. It would be closer to mead, and like mead, the resulting drink would have no head since that's created by protein, which there is none in sugar. There would also be no residual sweetness or any other flavoring other than the alcohol, so it would taste pretty bad. You can ...
Sugar doesn't contain the nutrients yeast need to reproduce properly. It's likely that you'd end up with a stuck fermentation, and off-tastes (notably cidery, from acetaldehyde). As Denny mentioned, that would be pretty much the only taste in there, so it would likely be quite unpleasant.
Because sugar is 100% fermentable, there will be essentially no body or head retention. Flavor would range from non existent to a harsh alcohol flavor. Without additional nutrients, fermentation will be problematic.
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