LCDS dont refresh like CRTs do. Today's LCD monitors typically have a refresh rate of 55-75 Hz, which is plenty fast enough for games. But comparing refresh rates between CRTs and LCDs is like comparing apples to oranges. CRTs are refreshed to re-illuminate a phosphor on the screen; they usually require a 70 Hz or higher refresh rate in order to appear truly flicker-free. LCDs are flicker-free by design, and are refreshed simply to show updates, such as "motion" in movies or games.
Probably the main cause of a "blurry" LCD is that it is simply set to the wrong resolution. Unlike CRTs, LCDs are designed to operate at a single, optimal resolution and refresh rate (e.g. 1280x1024 pixels and 60 Hz). If set to anything else, the display will be noticeably poorer.
Mine runs at 60Hz and there are no issues whatsoever playing games like HL2, DOOM3 and BF2. Oh it is wise to use v-sync but this is, I believe, more a video card isssue....cheers.
Hope that sells ya!