Think I found my first actual complaint with the shield and it's completely software related, possibly analog stick driver related. Could be corrected for in games, but after some testing all games are sort of struck by this.
You turn off mouse emulation and the analog stick movement in games is almost entirely static aside from the small zone in the center where you can make minor corrections. Movement hits "balls to the wall" max value very quickly IMO.
Nova 3 is brilliant with shield, a lot like a Halo 3 clone, I have spent many many many hours playing halo 3 so I was very excited. After playing for about 4-5 hours last night, one thing I could tell as being mostly different (aside from R bumper fire vs R trigger fire) was regardless of the sensitivity setting, the acceleration spectrum of the joystick isn't anywhere near the same.
You can turn down the look sensitivity and moving the stick quickly plateaued out on the speed you can look in any direction. You turn it up too high 3/5th-5/5th and it makes it impossible to make any kind of very sensitive minor correction. (no scopes) For me anyway, having it set to 1/5-2/5th sensitivity is perfect for the minor corrections in that game and getting those headshots with ease. But it makes making major corrections (looking behind you 180's) impractical. When playing on the xbox the more aggressive the stick movements the more it will accelerate your movement while still keeping minor corrections possible with minor movements. (I played halo 3 on 2/5th setting)
So, I went in and started checking other games, maybe it was just a problem with nova... and it's basically doing the same thing in every game. Spent a lot of time playing GTA 3 and same thing there as well. I didn't pick it up at first because for the other games I didn't have a good idea of "what right looked like" But other games like respawnables & shadowgun are sort of the same deal even though I didn't really have a point of reference for those.
I know it's not a simple thing to explain and ask for, and I bet a lot of people won't even notice it, or think it's just me. What is needed is the joystick equivalent to "mouse acceleration" in windows though.
EDIT: and there needs to be (or a bigger) deadzone in the center, that might actually fix both problems (push minor values outwards of the center some). I have found some analog stick ghost movements when my thumbs are off them.