I find the remaster to look a bit off, it looks kind of soft and the colors are a bit too saturated for my taste, but then again this is Blizzard and that has ben their jam since WoW blew up.
The only bugs I've encountered so far are text ones, maybe there's some skills that are borked but I don't think there are any major bugs that would affect most casual - semi casual players.
People complaining about the dated gameplay, that what most people wanted out of this remaster, many people abhorred the abomination that D3 was because it's basically an arcade game, no builds, no interesting items at all, just some specs for very little variety.
I played the current D3 season and I was able to level up to 70 within hours solo. After 2 weeks I had literally everything I wanted for my character and had entire pages in my stash of these new D2-esque legendaries that were "supposed" to be rare, the game then just became incredibly mind numbing, running the same 5 procedural maps to get the same drops but with better rolled stats and with the utter garbage of personal loot, you can't even gear other characters.
D2 and D3 are clearly aimed at different audiences, do you want an arcade and feel like god on earth and obliterate everything on screen with 2 skills and not have to worry about stats, gear, skills, etc? D3 does an excellent job, it's a very simple game for mindless killing and it is fun. It kind of reminds me of Musou games.
Do you want something more lasting and rpg-esque with gear that you'll be looking for (and will have to trade for) months but once you get it opens up a lot of builds? D2 might be up your alley. But keep in mind that this is a 21 year old game, don't expect hand holding or modern QoL. You start off very weak and but at the end you end up destroying everything as opposed to you start destroying everything and end up destroying but faster.
The discussion about this I feel is the same as many other games, especially RPGs. You have classic RPGs where you had to read what NPCs where saying to know what to do next and had somewhat convoluted skills trees as opposed to modern games, where you can just skip everything and a huge arrow will be pointing where you have to go and do. Different strokes for different folks.