BF2142 its medium-low but then I play in Titan mode which sometimes seems to suffer from lag and glitching.
Most of my lag seems to come from the game having trouble swapping data in/out, I mean, if I stick in one place for awhile, it runs fine, but the second I start heading out and the game needs to cache new geometry on the fly, it just stutters like hell on any occasion, be it a player running by, a vehicle, a particle effect (rockets), etc....bugs me right to no end, more-so since the game defaulted to high-detail in BF2 for me.
Guess I'll have to download the demo and see for myself, and if it runs just as crap without requiring me to set the detail levels down low, I ain't bothering.