Mainline Gears games have averaged ~93 (three games).
Mainline Uncharted games have averaged ~92 (three games).
So whilst people are going to have their opinions, and that is fine, ultimately anyone that thinks one series is substantially better than the other in an objective sense does not hold a view that is reflective of the gaming media at large.
(Source: Metacritic)
Edit:
In my view (personally) there are a lot of strengths inherent to each series. The shooting mechanics of Gears are definitely better. Uncharted has superior platforming. Gears has better overarching lore and story telling, but Uncharted has a leg up on character development.
Ultimately just two great series!
starcraft - Playing Games = FUN, Talking about Games = SERIOUS
