head to head
Crysis 2 asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Execution · Practiced Mastery
A nanosuit-powered FPS where you choose between cloaked stealth and armored assault through a ruined New York.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Crysis 2 leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Crysis 2 leans clearly harder on execution.
Crysis 2
Aimbot trivialises every firefight; aim and movement carry it
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Crysis 2 leans a little harder on reads, though the gap is small.
Crysis 2
Scripted Ceph and soldiers follow fixed patterns
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Crysis 2
Mostly known encounters with mild patrol randomness
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Crysis 2
Suit energy management and choosing stealth-versus-armor approaches
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.