Lets start off with the necessary 'Not this thread again' comment.
Now, I personally don't like DA2 or ME2. ME2, on my first playthrough, I actually found more engaging than ME1. Every attempt at a playthrough after that however I found it a massive disappointment, and it occurs to me that the only reason I liked it the first time was because I wanted to know where the story went. After that was all spoiled, there was no reason to play it. It was boring compared to ME1. In ME1, you had to think a lot more, you had more interesting moral choices (Sure, they still meant crap, but pulling out someone's life support or leaving it in, even after they are technically dead? That's heavier than anything ME2 offered). The combat was pathetic hide behind wall, pop up, shoot and became monotonous and horrible very quickly. The fact that you could only take about 5 bullets was a load of cripe as well. I want my ME1 combat systems back; Alpha strikes with multiple abilities, allies and enemies that actually have reasonable health, and the ability to semi-safely run around a battlefield rather than having to stay behind cover. Vermire was one of my favourite ME1 missions as it felt like a power mission: I just ran through it, not letting anything stop me. I never hid in cover, I never ran away, I died a few times doing this, but it was FUN. ME2's equivalent is run forward, duck into cover, shoot at things for a bit, run forward, duck into cover, shoot things for a bit, and what is with the 1 ability use thing? Why can't I use all my abilities consecutively? It is horrible from a design and gameplay perspective IMO as it basically forces the player to pick one ability and level it. From there, the other abilities have very little point as after the attack from that good ability, they will be in cooldown, and once that cooldown is over, I'll just use my good ability again. As I said earlier, I have had one successful playthrough of ME2, then many more that failed due to boredom. I have had about 10 playthroughs of ME1. guess which one I prefer.
As for Dragon Age, I'm not even going to get started on DA2, this post is long enough as is. Suffice to say, it was worse than the ME1 vs ME2 thing for me, and DA:O definitely wins out of the two.