I don't really like the first person mode just because of how clunky it feels.
When they optimize it and make it feel less clunky then I'd probably play more First Person.
I also don't like the fact I can't really tell where my fucking head is, because of the fact the gun is so low it just throws me off.
They need to work a bit on the whole crosshair thing, especially when holding right click as it's quite inaccurate to where you're actually aiming.