Did they FORCE you to sign the papers? NO, flat out. PERIOD. Read what you sign, understand what you sign, and you wouldn't have shit to bitch about. You NEVER had to buy a house to begin with, you could have rented this entire time, and yet YOU chose to buy the house, to sign the mortgage, and to take the risk.
I'm sorry, I can understand you wanting to walk away from your house because you owe more than you someone says it's worth. But obviously you FELT it was worth it when you purchased it, otherwise you would have been stupid to do so, correct?
My house 'lost' $35k in value from Spring 09 to Fall 11, but I'm not bitching. It's only what some schmuck told me it was worth, not what I feel it's worth and I have no reason to sell or move so the 'value' is moot at this point.
Again, do what you want, but at least be a man and own up to the fact that ONLY you put yourself in this position, no one forced it on you.