My first batch was pretty bad. It was a Dry Irish Stout kit from TruBrew, which had probably been sitting on the shelf for a year or two, considering there really are not that many homebrewers around here, and the ones that are, more than likely order online. Didn't rehydrate the yeast, and fermentation took about 72 hours to kick off. Brewed in the middle of winter, and fermented in a part of my basement that rarely gets above 55 that time of year. But, at the time, I of course that it was awesome - I made friggin' beer!! So, it didn't go to waste.
The one I dumped was much more recently. Was supposed to be an American Wheat, with a little caramel wheat malt. Well, someone messed up, as I'm pretty sure they sent me Midnight Wheat instead of caramel wheat, as my color should have been 5 or 6 but came out more like a 20. Had a package of 1056 in the fridge that sat a little too long and swelled just enough that I couldn't break the smack pack, so I went to the LHBS (not so local) and thought I was picking up a vial of wlp001, but instead grabbed a wlp002. Brew day was also a nightmare as I tried to rush it after getting a late start, made tons of mistakes, missed targets, etc. In the end, the beer just sucked - I didn't like it, and neither did SWMBO. I didn't foresee us drinking it, so it just got dumped. In hindsight, all the mishaps probably clouded my judgement, coming in with a bad perspective. I should have bottled from the keg and let it sit. Lesson learned, I suppose.