A huge improvement over the original Counter Strike (in my opinion)
What's new in this: Bots, yes they may be annoying, but they are great to practice on while playing by yourself before going online. There is also a single player campaign too, which isn't too bad. The graphics have been updated such as textures and effects. They aren't totally upgraded since the original Counter Strike, but they are noticeable compared to the original Counter Strike. There are also new character models updated since the original Counter Strike, like instead of having to choose between 4 models, there are now 5 for each team. All of the terrorists models now look like terrorists, instead of having that terrorist model with glasses, which DOESN'T look like a terrorist.
Overall this game is amazing, it's addicting and fun.