My first beer, while at least recognizable as "beer," was super estery from not bothering to control fermentation temperature (even a clean yeast like Safale US-05 will make a "belgiany" beer if you ferment in the mid-to-high 70's...), yeasty from bottling too soon, and under-hopped for reasons I'm still trying to nail down (probably just not enough hops).
It wasn't anywhere close to what I was aiming for style-wise, but it was at least drinkable, and it served as an excellent point of comparison to my much-improved second batch.