Anthraxus
Explorer
Even the "fun" builds can become superfluous if there are far too many present. The Dragonborn Draconic Sorcerer is a prime example of it. It's not the most optimized build, but I've seen so many of them that it's slightly annoying when I hear yet another player wanting to play one.
If you wanted an optimized Dragonborn build, Paladin would be the one. Oddly enough, I've only encountered one of them at any of my tables.
This thread isn't just about optimized builds that appear too frequently, but builds in general that you almost always end up seeing whenever you sit down at an AL table.
You guys would probably hate to see my Dragonborn Paladin/Draconic Sorcerer, then. I've actually only seen one dragonborn out of 30+ PC's i've seen, and no Draconic sorcerers at all. Weird.