Best: I've had a few that have stood out in my mind as downright incredible. I had a Wee Heavy that won me a number of medals, that when I killed the last bottle at maybe 2 or 3 years old, I'd call it a 45-50 point beer that'd hold its own against world class examples. I still have a few bottles of a Brett Tripel that's fantastic. My house Mild is also really good. My house Bitters too (Ordinary, Best, and Extra Special, all three), which is why I keep brewing them. I made a Düsseldorf Altbier that was really, really good. And I think my recent slightly tweaked rebrew of my 60/- is fantastic too. I've had a bunch of others that have been great, but those are the ones that stick out in my memory.
Worst: I've had plenty that weren't up to my very rigid standards (most beers if I think they're GOOD still aren't up to my standards), but only a couple that have been dumpworthy. My second batch was a Belgian Quad that fermented too hot and after 2 years still tasted like jet fuel. I also had a Strawberry Belgian Blond that I oxidized the piss out of and it turned into liquid cardboard. And then I had a spiced cider that just tasted like crap. Beyond that, they've all been at least drinkable.