Counter strike 2 is a glorified update and an okay one at that. There's very little you can do to improve the formula of CS.. The biggest change is more dynamic smoke that's affected by bullets and nades. Otherwise graphics have a literal "polished" look now... A bit warmer, brighter, cleaner and less gritty. The UI is also refined from what it was.
Gameplay wise it's the same old, bullet spread seems more random while moving but otherwise can't notice anything else.
There are a couple new maps but otherwise this update is just refinement.. don't expect anything to blow you out of the water.