One thing I thought about since pondering this thread is I can't think of a bad beer that a pro brewer made with the designation of Scotch Ale and I've tried many of them. Not many brewers even try to make a Scotch Ale. It's a good style.
I feel the same way, that most that I've had have been good. Of course I can't remember them all.
I think it's available year round, although probably not available much outside of Colorado, but the Odell 90 Shilling is fantastic. Did two taster trays there with some friends and that one blew the other 11 out of the water.
We just recently got Founders in Oregon, so I haven't tried Dirty Bastard yet, but I do have a bottle of Backwoods Bastard in the fridge that I picked up a couple days ago.