Which game is your favourite in the Mass Effect trilogy?

ME1, for the following reasons:

1) The idea of humanity still trying to find its place in this galactic society, with Shepard playing a major role in that, is more consistently integrated into the missions and the dialogue. In ME2 this comes up here and there, but since Shepard is commanding a pretty low-profile mission, his/her actions won't have as much impact on this. In ME3 everybody's on war footing.

2) Because not everyone knows who Shepard is in ME1, we get more of a look at the galaxy going about its business and interacting with Shepard as they would any other soldier or Spectre. In ME2 the interactions are often shaped by "you're the human who saved the Citadel" and "aren't you supposed to be dead?"

3) It probably had the fewest incidents where Shepard was railroaded into doing or saying something I didn't like, or where none of the dialogue choices fit with what I actually wanted to say.

4) The shipboard dialogues with Kaidan and Ashley were a little more detailed and extensive than most of the Normandy conversations in ME2 or ME3.

5) The "investigation" aspect of the Feros and Noveria missions is something that I'd like to see more of in games. Even action RPGs don't need to have shooting and swordplay all the time, and ME2 sometimes seemed like they were reaching for an excuse to throw in more combat when it wasn't always needed. (Thane's recruitment mission is perhaps the best/worst example of this - "Hmmm...just trying to find an assassin in a tower might not give the player enough to do, so let's have the security staff just happen to start murdering all the other employees right when Shepard turns up!")

6) It's the right way to do an open-ended conclusion - the immediate threat has been vanquished, but the Reapers are still out there and we know more are coming.

Though I will say that it almost loses this title for "machines can be broken" - one of THE WORST lines in the trilogy, IMO. I almost always spacebar so that Sovereign just interrupts before Shepard can say anything.

Mass Effect 2! A good plot + good companions's stories= awesome game!

Story in the first, characters in the second, gameplay in the 3rd.

ME1 and 3 are more or less tied with me. 1 because it was the first, and I felt most connection to the characters, Saren was the best antagonist of the series, and everything flowed so well. 3 because all the stories tied up nicely, the combat was far improved, and it was the most evolved of the trilogy.

ME2 is my least favourite. There are plenty of things I like about it but lots of things I despise with a passion. Of all the ME and DA games, ME2 is my least favourite.

Infiltrator?  I wanted to check it out, but it's no longer available.  Once found it and put it on my phone but the phone I had at the time couldn't handle it.  Later, when I got a better phone, I tried to find it again and ended up with a virus instead.  So, yeah, not playing it.  

I'd have to go with ME2. I have to say i really enjoyed the finale battle when choosing your squad for certain parts because for me it really mattered who I chose,it was a true life or death situation. For the first time it felt my choices truly mattered my crews lives were in my hands I weren't going to let them fall no not on my watch. (There may of been other times but I can't quite recall atm) I enjoyed the story and the characters we got to meet and have part of our crew.

That alone kinda sold it for me being a favorite by a little. There are so many other aspects that I enjoy from the other 2. The Citadel DLC...God damn that was absolutely fantastic that has to be my absolute favorite thing from Mass Effect...Maybe I'll change my answer to ME3 just for that haha.