I consider "accesible" to be different from "easy".
Civilization IV is an extremely complex and (depending on the difficulty level) challenging game, yet it is also "accesible" because you've got an intuitive interface, optional in-game advisors, helpful tooltips appearing when you hover over an icon, and an in-game guide to pretty much every unit, building, terrain type, political action, etc. you'll encounter in the game.
On the other hand, "The Witcher 2" had poor accessibility for me because your first quest involves taking on 5 well-armored enemies without much of a tutorial on how to use life-saving potions and confusingly-named spells. After you've gotten the hang of it, the middle of the game becomes ridiculously easy with things like the upgraded Quen spell that completely absorbs damage AND reflects it back onto several enemies at once AND leaves them wide open for a counter attack. Of course, the game doesn't allow you to spend any points on these actually useful abilities before you're Level 6 (yeah, you can learn to throw daggers, which would be nice if you actually had those in the prologue)
Civilization IV is an extremely complex and (depending on the difficulty level) challenging game, yet it is also "accesible" because you've got an intuitive interface, optional in-game advisors, helpful tooltips appearing when you hover over an icon, and an in-game guide to pretty much every unit, building, terrain type, political action, etc. you'll encounter in the game.
On the other hand, "The Witcher 2" had poor accessibility for me because your first quest involves taking on 5 well-armored enemies without much of a tutorial on how to use life-saving potions and confusingly-named spells. After you've gotten the hang of it, the middle of the game becomes ridiculously easy with things like the upgraded Quen spell that completely absorbs damage AND reflects it back onto several enemies at once AND leaves them wide open for a counter attack. Of course, the game doesn't allow you to spend any points on these actually useful abilities before you're Level 6 (yeah, you can learn to throw daggers, which would be nice if you actually had those in the prologue)