As much as I enjoyed Luigi's Mansion on 3DS, I've found myself wishing today that it was ported to Switch instead. There are times where I honestly can't say how I feel about LM3DS. I...liked it a lot, in some cases even better than GC due to the fact I had one of my all-time favorite games portable now, but I'd be lying if I said I didn't miss the better controls of GC, along with some other things exclusive to the GC version.
However, I don't hate this port. I definitely understand why some people hate this port, but I also feel like some of the hate is a bit extreme? Like, I won't disagree on some of the critique: The co-op was BAD. Reaaaalllllyyyy bad. I'm honestly surprised Nintendo let that get through QA, it looks barely playable and them allowing something of such low quality to be released is very unlike them. Framerate issues for singleplayer are something I don't understand (assuming you're not talking about base 3DS; if you are, then that is a very valid complaint), because on New 3DS, there was only two spots in the game I can remember seeing frames drop, and they were thankfully only cutscenes.
The controls are...not bad. They're not as good as the original, but they are serviceable, and feel pretty good once you get used to them. I completely avoided using the N3DS' C-Stick, though, as that thing sucked for LM3D with how unresponsive it felt. I've heard modding it by glueing some fabric or putting painter's tape on it makes it better, but by itself, it was terrible. I played through the game using the "hold-B" method of aiming, and while it took a lot of readjusting, it eventually felt nearly as smooth as GC once you realize that the best way to aim Luigi is to flick the circle pad a direction and tap B to have him aim in a specific spot rather than trying to hold B and then rotate him into the position you want.
Graphics actually look better than GC to me. The only thing missed here are the neat particle effects of the GC version, but for a 3DS game? LM3D's textures actually look better, have more detail, and all in all are a lot easier on the eyes than LMGC's muddied blobs. The lighting is also a lot nicer, which I guess is an unpopular opinion? IDK, people get really touchy about lighting in ports and remakes in my experience, as MM3D got a lot of flak for its lighting changes too. Luigi's character model looks SOOOO much better, holy cow. He walks, runs, and all in all just looks nicer than GC Luigi, which is super cool IMO. King Boo also looks really nice, as I like his DM model quite a bit more than his LM model. The other ghosts unfortunately look a little too solid for my liking (I miss the cool ghostly transparent effects), but all in all still look good.
However, even though I defend some of the port...I won't lie, it should have been on the Switch. It just should have been. I enjoyed it, heck, I even loved it as much as LMGC once I adjusted to the controls, but it objectively was a bad port and probably shouldn't have happened. The only real reason I bought it is because my GC copy is in pretty rough shape and might break any day now, so while I do appreciate LM3D, I sincerely hope that they simply consider porting the original to Switch someday, as that probably still is the definitive version.