Andromeda, on a pure gameplay perspective feels very nice, and should be very robust. The problem is that its combat encounters don't really evolve to force you to change your tactics. Once you figure out how to deal with enemies with armor and enemies with shields you've basically learned everything you'll ever need to know.
One need only look at the Architects for the clearest example of this. They're supposed to be the giant combat challenge, and the first time it's interesting and fun to learn the needed tactics.
But then you encounter the second one and realize it's exactly the same mechanics. And then the third, and it's the same again, except (depending on the order) maybe you have to deal with an environmental condition. And then a fourth, at which point the fight is extremely rote and boring. Four "super bosses" that are more or less the same experience over and over again.
Compare with Dragon Age Inquisition and its dragons, which each had a (semi) unique gimmick. Some of them armored up at certain points, some had the (super annoying) electric aura attacks, others would call in adds, etc. The point is that the tactics to fight one dragon wouldn't necessarily translate to another.
But going back to MEA, this lack of variety in combat situations means that it gets very old in the 60+ hours it takes to complete the game. It's wholly up to the player to decide to switch up their abilities and weapons simply to create some change.
In addition, since you have access to all abilities with your single character, there's no drive to replay the game as a different class because you can just swap your current character to whatever you want him to be. I think that also plays in the lack of my desire to go back to MEA.