From the hundreds of reviews iv read...
micronet: good service. good rates. by far the best customer services. speed limited to only 512kbps (in home unlimited category)
Linkdotnet: these guys have no limits, for the worst that is!
PTCL: chalay to dorta hai, na chalay to rota hai!
wateen: is yateem ko koi naya ghar chahiay...
if you want good DSL i suggest u go for the new fibre telephone lines of PTCL (and they'll work for PTCL only)...they're simply flawless