When playing D&D, I platly it like a board game without the board. My character is a meeple. I want the puzzles, riddles, and dilemmas to challenge me, rather than the character. 'Roll to solve the ancient puzzle lock' would bore me.
When playing a MU*, I'm the opposite. I am in character and want the character to be able to do what the character can do, rather than what I can do. This, I lean more towards reaching out via pages or OOC and making sure that the player understand something, in case they are operating under a misunderstanding.
EDIT - Changed "player" to "character." Don't post while drunk, people. It leads to stupid errors like that.