This remake takes everything that made the original game special and throws it all in the trash. Not only is the soundtrack worse (color your night and its going down now are the only better ones), but Tartarus, which was the only part that needed to get better (although I didn't find it boring in the original game), feels and plays worse because the floors are bigger and slower to go through and the enemies are too easy to fight and avoid, so, unlike in the original, I didn't feel the need to fight at all.

The overworld doesn't look interesting anymore, and all the atmosphere of the original is gone. I just feel like there are too many people, and that the isolated and lonely look that the city had in the original was better because it set the perfect tone for the story and its themes. The voice acting is worse, with Akihiko's voice sounding too deep (and in general, the whole cast sounding a bit worse, imo); the new in-engine cutscenes that replace the animated ones are executed badly and lack emotion, for example, the intro scene, which was, at least in my opinion, one of the best ones, gets ruined because of Yukari talking and ruining all the tension that was created in the old one.

I don't think I'll ever understand the hype for this remake since almost everything that it tries to improve was done better in the original game. 

“We can forget happy things. We can probably forget sad things too. People have the power to forget.” 

I haven't stopped thinking about Mother 3 since i finished it a week ago, and i can confidently say that this is one of my favorite games of all time.
I love everything about it, the characters are awesome and fit perfectly in the world (Duster and Flint are the best ones imo), the music sets a perfect tone for each setting, the gameplay was fun but grindy at times, and the story is probably the most amazing part, with each chapter being interesting in its own way. (The ones i liked the most were chapters 4 and 6).
This was an incredible game and I think that everyone should experience Mother 3 at least once in their lives.