Knocking guests off the stoop for fun and profit- possible disadvantage OR advantage! 
There's no reason you can't do it. In some cold regions of the world (like Scandinavia), outswing doors are normal (they seal better into the weatherstripping when the wind is blowing hard).
They are much harder to kick in (the frame is thicker, and is a rabbeted frame), IF they are installed properly (they never are).
The locks aren't any easier to pick, but the strike might be easier to slip (if they are installed incorrectly, which they usually are).
If it doesn't come with tight pin hinges (non-removable), you can swap them easily.
Sticks, snow, etc are correct. In MI, I wouldn't do it if you don't have a stoop or step which is AT LEAST 6-8" lower than the door. There is a safety issue for egress if there is snow outside.
And technically, there is a code issue related to minimum stoop size for an outswing door (which may or may not be a problem for you personally).
If you have stairs leading up to it with no stoop, it's hard to unlock then swing open (as you walk backwards down the steps) before entering.
But generally, there is nothing wrong with outswing doors. I installed one last week.
