I honestly think Condition Zero is better then the original CS. (Yes, sue me.)
PROS:
+Better graphics than the original
+Gameplay is fun
+A tad bit more challenging
CONS:
-Not as many people playing CZ over the original
-Valve doesn't update CZ anymore aside from maintenance updates
-Development hell makes the game feel rushed

If you liked the original CS I think you'll like CZ. Give it a try.

I honestly think Condition Zero is better then the original CS. (Yes, sue me.) PROS: +Better graphics than the original +Gameplay is fun +A tad bit more challenging CONS: -Not as many people playing CZ over the original -Valve doesn't update CZ anymore aside from maintenance updates -Development hell makes the game feel rushed If you liked the original CS I think you'll like CZ. Give it a try.