In a circumstance like that it's quite possible that the meat has remained cold enough to prevent bacterial growth. What you should do is estimate whether the surface of the meat was at 40-45F or if it was substantially higher than that. 40-45F should feel like unfrozen ground meat at the store. If it was that cold you should definitely be fine.
If not, I would throw it out if I were on the cautious side about germs. Yes, probably being in a 350-degree oven for an hour will cook the meat thoroughly and kill any bacteria in it, but bacteria is not the only issue: bacteria can also leave behind toxins and can give the meat a bad flavor, even if you later kill them it's not good to eat.
If not, I would throw it out if I were on the cautious side about germs. Yes, probably being in a 350-degree oven for an hour will cook the meat thoroughly and kill any bacteria in it, but bacteria is not the only issue: bacteria can also leave behind toxins and can give the meat a bad flavor, even if you later kill them it's not good to eat.