Actually I have a list of sites where you could download decent drum samples, but I´ll post it later. There is also a trick you can use with midi drums, take each sound for example snare, and add reverb and eq or other effets to it, try to change it to make it more natural sounding, not just load it and put it in your sequencer. Try to vary the velocity of the hits randomly so it does not sound like a machine, also vary the timing or quantization, so not every hit is 100 % dead on the click, speed and drag some just a bit. You could also run the signal through some guitar stomp boxes to add cool effects or play the drums through a speaker in a room and mike the speaker to add "air" and reverb. Oh well, you wanted samples, I´ll post it later.