head to head
Guild Wars 2 asks more than Grand Theft Auto: San Andreas, and the gap is reads.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Optimization · Practiced Mastery
Active dodge-heavy combat with a deep build system, tested against both scripted content and human opponents.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Guild Wars 2 leans Optimization (Practiced Mastery).
Guild Wars 2 leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Guild Wars 2
Dodge timing and active combat define moment-to-moment play
Guild Wars 2 leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Guild Wars 2
WvW and structured PvP feature real adaptive opponents
Guild Wars 2 leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Guild Wars 2
Loot RNG is present but secondary to skill expression
Guild Wars 2 leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Guild Wars 2
Build crafting and rotation theory-crafting reward deep analysis
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.