While I agree there's no rule that orcs can't intimidate the players into surrendering, I think it just a bad idea. I've heard of what noble npcs can do to a party in star wars saga edition and I'm not looking forward to seeing that in 4e.
As for intimidating being hard to do in 4e, remember this:
1) Its an autowin. Fighting big bad dragon. If you win with intimidate, the fights over, even if the dragon has 100 hp left.
2) It hits multiple people at once. Use it when there are a lot of bloodied creatures, and even with the hard check you are likely to get one or two. That can still be pretty significant.
As for intimidating being hard to do in 4e, remember this:
1) Its an autowin. Fighting big bad dragon. If you win with intimidate, the fights over, even if the dragon has 100 hp left.
2) It hits multiple people at once. Use it when there are a lot of bloodied creatures, and even with the hard check you are likely to get one or two. That can still be pretty significant.