In a straight up fight between MDW's and TMWA, I do believe that Mountain would have a serious advantage, but since Ravnica became legal, it's, for the most part, a moot point. Suppression Field and to a lesser extent,Darkblast, eats TMWA alive. It was a major force in the New Hampshire part of the New England Meta for 3-4 months. Then, Ravnica was released, and the deck almost totally disappeared from our Meta. It literally disappeared in one day. Waterbury day one had somewhere between 4-7 copys of the deck. Day two, I didn't see a single TMWA decklist ( and I was helping Ray day 2, and amoungst the things I was helping him with was Sorting decklists. And the major differance between day one and day two? Ravnica was legal.
More to the point, there is alot of similarity's between the two decks, but unlike Mountain, it doesn't get eaten alive by an enchantment. Oh ya, and it's got blue, which naturally makes it sexier. This deck certainly does look like a contender, but i think It suffers from rather major flaw. It doesn't go Broken like Stax, Gifts, Oath and the others, and the best Vintage players like decks that can suddenly blow their opponets out of the water. Using a Chess personality analology, our better players are Tal, and this is a deck for players like Karpov, which we, as a whole, are sadly short off.
Actually, TMWA only disappeared because those of us playing it haven't been to many tournaments in a while. You must not have been looking very hard on day two of waterbury because I know of at least 1 TMWA deck playing, and there were at least 2 decks running red genju (ray commented on how he could die after having seen two genju face off at the top tables during round 3).
TMWA beats suppression field by the 4 disenchants main. It's 2/1's and 1/1s will beat down regardless of field, and since this deck is just a bunch of 1 and 2 toughness creatures, we'll trade up while I'm magma jetting my way into a disenchant with blast backup. Then, once I DO get to disenchant I switch from beating down for something awful like 3 a turn, to something insane like 8 a turn. Field is a really minor speedbump.
Darkblast is a much more scary threat than field, and even that, we have 3 crypts main for when one of our dudes gets burned out.
Honestly, just looking at it on paper (but I WILL do some real-world testing when I get a chance) makes me think this matchup is very much in favor of TMWA due to the sheer number of solutions that TMWA packs, vs. how this deck can answer.
Note that these two decks are VERY similar, and for somone who is going to eventually want to play a drain based archetype, I would steer them towards this deck, as it includes the duals, fetches, forces, and relevant power.