I think its great for Stiemer to get the run he is getting -- but not so good for the C's. He is an endearing player for sure, and I think a gifted shot-blocker. However, right now you want him as your 3rd string C not your primary back-up to an out of position starter (I say this despite all that KG has given since taking on the starting 5 role).
But good for Greg to be getting minutes that will help his development. He works, he tries and he contributes a bit and rarely embarrasses himself - that's great for a 3rd stringer, but not enough for the role he is playing.