Very much so. I'm especially impressed with DD:Dark Arisen's combat and I really enjoy going out into the world at night. Admittedly, Mass Effect 2 is my first Mass Effect game but I am already in love with the universe and the characters. I do plan on playing 1 and 3 eventually. Both are excellent so far.
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Dragon's Dogma surprised me when I first played it with how good it is. Dark Arisen adds a lot of stuff too. Mass Effect is good to be sure. It's definitely worth playing the other two.