I've had some lemon flavoured beers over the years that I've rather enjoyed, Salopian Lemon Dream being a more recent one. The real turkeys from Brodie's are the sour beers. I really don't think I could drink a pint of any of them.
I've had tasters of several of them and they were all vile. It got to the point in the William where when a new one came out I would ask if it was worth having a taste to be told no, so I gave up even asking in the end.
This year's Xmas beer was a spiced sour which sounds the biggest turkey of all.