I like Dragon Age a lot, but I love Mass Effect. When playing Mass Effect I felt that Shepard's story was my story, whereas with Dragon Age I always feel like I'm just along for the ride on someone else's. If I want to save the council, screw Cerberus out of the Collector base and cure the genophage I can do that. But if I want to give the Dalish lands in Ferelden, save Kirkwall from Meredith and abolish the Circle forever, then I am completely out of luck.
Funny, that. It's the exact opposite for me.
I love Thedas and it's cultures, most of the characters and all of my protagonists. Also, DA's dominant themes are such that interest me, and are more often presented in an interesting way that doesn't suggest a specific ideological stance. And lastly, DA games enable roleplaying much better than the ME games. For me, DAO is still the best game Bioware ever made, and my main Warden Eorlin Amell my favorite protagonist. As for DAI, it went in the right direction after DA2, and my main Inquisitor would've been hard competition for being favorite protagonist if not for Trespasser's ending which nullified all her ambitions in one fell strike without giving me the opportunity to play against it.
Mass Effect was enjoyable overall, but something of a bumpy ride. Also, it was extremely hard to roleplay a Shepard I like. The predefined template "badass space marine" doesn't really appeal to me in the first place. Also, I prefer somewhat harder SF, and I'm particularly unforgiving of biological nonsense, of which there's plenty in ME. And lastly, the way ME presented its themes I found thoroughly unappealing, suggesting an annoyingly traditionalist ideological stance. The endings didn't help. ME had the potential to be something great in the hands of a competent writer, but it wasted its potential on insulting my intelligence, a canonically stupid protagonist and contrived drama.
As a result, my default attitude towards future DA games is "will buy", while toward's future ME games, it's "will be thoroughly spoiled before I decide".