I have had more than a few beers that were way too green when I bought them. I find this usually has happened with big beers, one-offs, special releases and the like. The brewery doesn't necessarily know how, say, 6 months of having a porter on some just-acquired bourbon barrels will be. So they do it, and its too much, but they release it anyway. Its not great at first, but after 6 months in my basement, it's perfect.
Kegged: Citra IPA
Fermenting: Dusseldorf Alt
Planned: Black IPA, Munich Helles, Belgian Golden Strong, IIPA, Serrano/Habanero Cream Ale...