Eh, too be honest, I love Gears myself, but I like uncharted's gunplay a little better. I went back and completed Gears again just for comparison, and it feels alot more confined. Things like the whole mine cart ride and the shoot the kryll bats part annoyed the hell out of me. There's alot of parts in uncharted where the action revolves around a large central area with two levels, and you find yourself always having to find new cover and doing quite a bit of twitch shooting and planning. I did find the last boss part of uncharted to be a little dissapointing though. If you enjoy Gears alot more though, its understandable, but I don't think uncharted is worse in any way.
Definately give the game a full run through ,because I feel like the beginning is there to ease the player into the rest of the sections.
I understand you don't really like the ps3 and everything, but don't like sfag hyperbole and everything ruin it for you. Don't expect it to blow your understanding of game mechanics away.