Uhm, well, not really too good. As I said it's not game-breaking in itself. However as I said the problem is that, at high levels, there's less offset of that advantage; that was my impression at least. In the previous thread I made a comparison between dwarves and minotaurs, and I said that dwarves were a way better race; but, I was thinking of very low levels, where sw as minor, dwarven weapon training, and the other benefits are really felt a lot; moreso than the bonus to dmg IMO.
However, as you go up in level, class features and feats start to outpace in importance racial benefits and feats; you have more encounters and daily powers and so you're much more likely to deal multiple dice of damage with each attack (which obviously benefits an oversized-weapon wielder). On the other hand, you can compensate you race's weaknesses with feats or class features, like a fighter choosing healing powers; hps are much higher and you companions can heal you more too; I'm thinking dwarf as a comparison again, but it can be expanded to other races, obviously.
What I mean is, while at low levels you're actually losing some great benefits for a single very good one, at higher levels the loss is less and less significant, while the advantages can only go up.
So I feel the Dragon minotaur is more in line with that; also, to the people that feel that goring charge is too weak: please look at the racial feats; for example, if you take the three good ones at heroic, you gain an at-will opportunity attack at +2 that deals 1d8 dmg, pushes the target 1 square and knocks prone: that is very good for heroic.
Beast within is good and Brutal ferocity is awesome: you're going to use an invigorating power with it, granted. Have you read the beastblooded PP? It's very good and flavorful, and too good too, maybe, infact.
These are my impressions; if you would like to take a look at the game I was referring to, there's a link in my sig (the elemental chaos one).