in my opinion it makes games look and feel smoother
I personally disable motion blur in like every game I know.
It has a really tacky annoying feeling whenever the game runs at under 59 FPS, or when the sensitivity is too low. For example I think the motion blur in Arma 2/3 is simply horrid.
Source games have the blur done right, so I leave it on there, but it's like the only games I ever have it on though. Not even racing games make an exception, I like to see the details and even so it's hard to focus on anything except straight ahead so motion blur would be nice and add to the effect, but in racing games it just seems like a excuse to make the scenery look bad. Many racing games take advantage of motion blur and make the scenery look worse.
But I think motion blur would suit Blockland well if done right.