It really annoys me when I want to play a normal game online, and then the opponent starts playing...

The problem isn't that the opponent starts playing or something like that; these types of players always end up losing, and they don't have an easy time at the beginning either. Heroes should encourage good gameplay with each new installment, but Black Hole caters to not-so-good players. Playing as Archers is a sign of a low-quality player.
Honestly, I liked all the new features in Heroes 6, and it seemed like they were just anticipating my desires, which is why I forgave them even for the lack of Town Exploration (because I thought it encouraged smarter gameplay and more flexible tactics). But this support for Archers and, as a result, for noobs, just infuriates me, and it's also unrealistic.