I like FPS just fine. As a matter of fact, it's what I play most. But after playing the masterpiece called COD 4 it was hard to like Warhawk. I bought Burnout for a change of pace. Burnout is a superior game to Warhawk, albeit a different genre. (at least I got a Bluetooth headset out of the deal, so it wasn't a total waste)
Same experience here. I've been playing COD4 on my PS3 way too much for a couple of months, and I found I couldn't make the leap to Warhawk.
The controls and the UI of Warhawk seem very clumsy and inexact. Compared to COD4, Warhawk felt like I was playing in molasses. Aiming in COD4 is fairly precise and quick, where Warhawk seems heavy and cumbersome.
Also I found the experience of playing on those huge Warhawk maps to be a drag. To each his own and I'm not really saying Warhawk sucks. I'm just saying it sucked for me. There's a difference, you know...