First, I’m pretty sure that a tank by definition requires treads (wikipedia backs me up on this, but I’m no military historian). If I recall an episode of Mail Call properly, tanks have treads because a wheeled base can’t support the weight. I think the wheels paired with the tank give an impression that it defies physics–I bet if you rebuilt this with treads, it would suddenly look more ‘tank-like’! However, what looks good should trump realism!

Second, the squat looking turret is definitely abstracted. It reminds me a great deal of Advance Wars. If the barrel were redone, I think that would also help to make it look less ‘odd’.

Note that this is just my analysis of WHY this tank looks odd. I do like the way it looks! :) I especially love the shovels on the rear of the tank: they manage to be a greeble-like detail and a functional bit at the same time. Do they represent a curve to the tank? Or are they tools for the crew? They’re quantum tools!