Out of 15 all-grain batches so far, I've only considered dumping 1. It's an Anchor Steam clone made with Munton Maris Otter that is really, really cloudy. Almost to the point of being muddy looking. It tastes fine but it's very unappealing.
I had a mild that looked similar and after gelatin and time, it is now my clearest beer so I'm going to try the same with this one and see if I can salvage it. The rest of this malt is being saved for Stout season.
The important point is that I am more than willing to dump it if I have to. I'm no expert but I know now that I can do much better and I need to feel happy about the beer that I drink and serve to family and friends. Keeping it for private consumption would just extend the pain.
I had a couple super cloudy beers made with Crisp maris otter. I added some gelatin and within a week they are now very clear. Makes me not want to throw the whole bag of MO away.
I was considering dumping them if they didn't clear, but not they're pretty good, which is a relief.
I haven't really dumped a beer before, but I'm getting to the point where I'm okay with it if I need to.
EDIT: now that I remember, I recently dumped a double IPA that got infected. Tasted good when I bottled it, but I'm thinking it got infected from the bottling bucket. Every bottle foamed over like crazy when opened and tasted off. Sad...freed up a bunch of bombers though.