Buh... duh... puh.
Half-Life: Blue Shift svcks compared to Half-Life way more than DA2 svcks compared to DA:O. One game in a series doesn't mean anything.
Depends on how much you liked or disliked whatever aspects of the game they changed.
IMO ONLY PERSONAL OPINION ALERT:
DA2 really svcks. Because of what they changed, restricted, rewrote, ignored, and short-changed the player on. They took out choices and forced players into generic stereotype characters. The combat was sped up to cartoon levels. Conversation and dialogue was not up to what they did in Origins. Some of the quests were downright ridiculous [returning a chunk of rotting corpse to the next of kin that you psychically discovered, to hear "Oh my, I thought I'd never see that again." and you couldn't even reply "Well then, don't go exploring the one cave in Kirkwall while carrying your family member's rotting body, okay?] That's ignoring the [censored] templars who never react to you using magic in front of them at any point in the game, even before you are rich and "untouchable because of your position". I won't get started on the "unique" companion things that I didn't like, the least of which was the "wearing lingerie in a fight" part. I could keep going, but I'll refrain.
Suffice it to say that I will not be buying DA3 unless a lot of things change from DA2.