well, heres the thing, lots of cs maps are really crappy, but lots are really fun that offer lots and lots of different situations and great varied gameplay, a classic is cs_assault for example, i played on this yesterday at a lan place and it was soooo fun and varied i couldnt stop for 2 hours straight! (till i ran outa money) and then there are maps that are real crap and boring (made in like 2 secs and made up of like 5 solids) that are rubbish. there are a lot of ripoff maps like off iceworld (even i have been victim to making a ripoff of iceworld (shame on you jax))
half life multi also has lots of crap maps but good ones aswell, but hl sp is very fun to play thru once and there are maps that are fun once u play thru them the first time but are still very well made and stuff (ex. MINIMICUS) dont get me wrong tho, hl has many many decent maps
basically all im saying is that there are quality maps and there are crap maps, all you have to do is look out for the right things to play to have a fun time
also, sorry bout wasting your time guys i had to get this off my chest