yeah if the 120GB is half the speed, its a total waste to me.

i know this isnt exact science, but looking at the number of newegg reviews on products, one can guess the sales ratios
for the vertex 2 there are:
391 for 60GB
287 for 120GB
63 for 240GB

so yeah, the SSDs being reviewed seem to make up ~10% of the sales, and the lack of lower capacity reviewing lets companies get away with giving out really horrible performing drives.