From the Delaware Small Claims Court page: "The most you can ask for in a small claims case is $15,000" - just noting.
Right. Beyond that, you need a lawyer and have to go to Delaware's Chancery Court, where multibillion dollar corporate cases are routinely decided. If Mt. Gox owes you more than $15K, you probably do need a lawyer. However, for amounts up to $15,000, there's a small claims court option.
My point here is that you don't have to just bend over and take it from Mt. Gox. There are ways to compel them to pay up.