Probably, if these folks wanted to be "n00bs" and get "pwned" they would have started playing WoW. The fact that they came to a real life role playing game would seem to me to indicate that they want to roleplay. Please at least talk to the players before hand so that the eminent beatdown won't completely sour them on the hobby before they get a chance to explore all it's splendors.
I've been through games where very similar circumstances have occured, and refused for many years to play in games ran by people who have started campaigns that way. You have to be prepared for the PC that will tell any authority figure that they have a brunch meeting with some associates that really must take precedence, so sorry.
I once had a DM have the party summoned before a goddess, who put a geas/quest on me to go on some quest to save the world after she spent a quarter of an hour bad-mouthing my character's patron deity, his personal appearance, and the circumstances of his birth. I had the character sit down on the floor and explain that dehydration would kill him before her spell, so she wouldn't have to worry about his murder tainting her lawfulness or goodness, but since he was part of the group that was "vital to the survival of the world" she should turn back time to his arrival and try again with a civil tongue.
Make sure you're telling a story with them, not to them, or they'll resent it and might miss out on roleplaying all together because of it.
Oh, and no, you're not mean.