The player's skills have more to do with success than the character's skills. That is not roleplaying. A person with a 100 Lockpick skill can still fail at a lock in the minigame, but by all rights should be able to open the lock. That is not role playing. When you can get around skill requirements in the minigame, then the action is no longer part of your role.
Another misconception. Characters with 100 on skills should still have challenges before him/her. Somebody with 100 lockpick should still fail at opening an extremely complicated lock, at the first try anyway. (and it's quite funny because in Oblivion with 100 lockpick you can't fail the minigame either...). If the it 100 would be unfailing, then characters with 100 on weaponskills should win all battle.
But how is it not roleplaying? You just have a bit more control over your character, but their skills and attributes still matter.
If getting around skill requirements the problem, Fallout 3 fixed it again by adding minimum skill requirements for locks and computers.