No. It shows that Ubisoft is doing a good job with their PR.

Yes, it does show that they are doing a good job with their PR. But PR only brings results if there is a high level of interest in the product from the community. If players aren't eager for the game, no amount of promotion will help.

Quite the opposite. They released Clash, now there are card duels, and next they'll launch some kind of browser game or online nonsense, and they'll use the same PR to promote it. It's like, "new and beautiful."

You also forgot to mention Dark Messiah and Heroes Kingdoms. The latter is that very online browser game. But since you didn't even notice its existence, it probably doesn't hurt the series much.

By the way, IMHO, Duel of Champions is interesting not only because it's new and beautiful. I think the game is quite clever, despite being casual. And in general: why does everyone think that casual games are bad? After all, the entire gaming industry started with them. Chess, by the way, is also a casual game.

Really? On the contrary, by introducing new monsters primarily in the duels, you can spark some interest in them in the main game as well. After all, the same principle will work again: beautiful graphics + PR.

This would only be beneficial if Duel of Champions were more popular than Heroes 6. But the game is unlikely to become more popular. Because, IMHO, it is aimed at a thinking audience. And Heroes 6 has more beautiful graphics :]