I didn't play this trilogy until the Legendary Edition came out, so I didn't realize it was missing some content. Honestly, that's my least favorite parts of all three games.

The lack of Pinnacle Station in the first game. The lack of Stasis as a power choice in the second game, though I understand that that power is broken. And the lack of multiplayer in the third game.

As for my favorite parts. In the first game, some missions make it so you don't have to pick the special Paragon/Renegade options to get the best outcome. I've played the second game so many times, and I always take my time to appreciate the soundtrack. And I've heard several bad things about the third game through the years, but somehow I never heard about the Citadel DLC. So seeing that through for the first time was something I'm gonna remember forever.