They don't list middlecoin on that comparison page. It is a good chart but the pools it tracks change often and rarely include the ones I have used.
FWIW, I started with middlecoin 8 months ago. I ran my own charts comparing them with hash cows. There were daily differences but on average they were similar. That is until middlecon jumped on doge before anyone else and hash cows ran off with my coins

I don't have any side by side comparison of middlecoin vs other pools any more, but to the people who claim middlecoin is dead I can certify that they are not. They may or may not be competitive in their coin selection. That I do not know.
I can also certify that they DO pay once you get to 0.01 coins and they always have. I have 8 months of history that confirms it. Whether they pay out dust after a week is a completely different story.
If the worst people can say about a pool is it doesn't automatically pay out balances so low that it won't even buy a cup of coffee .. Well, that's pretty high praise.