Driveclub is my GOTY. Despite it's rocky start, it's an absolutely sublime racer that not only had it's online issues sorted a while back, but is a much more comprehensive game today.
I also very much enjoyed Destiny despite it's issues, of which there are many. Lack of content and grindy design aside, the gunplay is fantastic, and I absolutely love Crucible. It was also extremely fun collecting all the different Exotics and Legendaries, and even levelling them up, till they made you do it all over again that is. And it worked very well day one. No glitches, online issues or anything like that.
Can't speak for Unity as I've yet to play it, but from what I hear the tech issues have been mostly sorted? Just the micro transaction centric design, and overall gameplay issues compared to previous instalments as negatives from the sounds of things.
Master Chief Collection seems to still have persistent online issues despite the numerous patches, and as far as I know many of the campaign issues still remain too (checkpoint woes, frame rate issues etc). It has some sort of BETA programme starting several months after release too?
I guess if I had to pick one it'd be MCC, namely because it's a bigger franchise than the others I feel, and on the whole was more important not to fuck up. I also feel that given the fact that it's a port job, it should have had far more polished campaigns, with more consistent visuals, less bugs, and a locked 60fps. I honestly think the repercussions of MCC will be felt a long ways in to the future. This is a massive blow to the franchise and it's legacy.