Geforce FX 5700LE sucks!
I second that.
I own one of these (PNY Technologies FX 5700LE) and they range in the low end of the FX series along with the FX5200 and what have you.
In my humble opinion, calling it something with "5700" borders on deception, as its specs are closer to that of a Ti4200 (around 250 mhz on the core, 500 mhz for the RAM, 4 pixel pipelines).
Incidentally, that's what i originally had (it broke, the store swapped it under warranty to the 5700LE, since the Ti4200 was no longer in production at that time), so I'm not complaining, but the LE is certainly no match for the latest generation of games.
--edit--
I found Doom3 to be rather demanding and I doubt many systems can manage to run it properly with all the bells and whistles at a very high resolution, save for the top of the line ones, maybe.