The Horde and the Alliance were pretty grey and subjective compared to the Dominion and Exiles. The Alliance is closer to the Dominion and the Horde closer to the Exiles, but there aren't enough similarities to compare them the way you want to. So, you have it correct, but "kinda like" is about as far as you can go. Even in a Dev interview they say something along the lines of "If you want to be hated, Dominion might be your thing, but if you want to be seen as the underdog, Exiles are for you." It's not possible to label the Dominion/Exiles as "good" or "evil", but there is no denying that the Dominion are straight up jerks (For lack of a censored word) and the Exiles are nicer. Well, you could deny it, but it is evidenced in so many things that it is ridiculous. The Alliance weren't as jerky as the Dominion when it comes to other races and conquering and all that jazz. The Horde weren't as nice and peace-wanting as the Exiles. So yeah, they were similar, but much more gray.