Blyster...If I understand you correctly....you put in a limit order to buy at .117 and they got you a better deal at .116??? Why would you be upset about that? When a stock is somewhat volatile this can happen. If you had an order in to sell at .117 and they sold at .116 then that would be a different story. Be careful with market orders...you won't know what price you will get until after the fact. I very seldom use a market order anymore.
Yes they can fill your order lower than your order limit. That's why it is called a limit. It's not illegal, and it helps you get a better deal for your buck. Same goes with selling they can sell higher than your sell order.
Would you bitch if you bought a Prius and they gave you a ferrari ?