Just beat the game on PS4 with an offline character. Probably 40-50 hours total since I had to backtrack a good amount to find everything I needed. It actually didn't give me many issues... At one point a couple times after I backed out to the menu then started up the game again it kept loading my entire belt with mana potions instead of the health/mana mix I normally use. Sometimes I noticed gameplay was a little choppy so I would quit/reload the game but really nothing major. The worst I had was in a LONG gaming session, between saves the game crashed, and I had to redo like ~3 hours of a dungeon again... but that's pretty much the same you have to do if you save and reload a game since all the enemies re-populate every time anyway...
My biggest issue is actually the 20 year old game itself and how a bunch of things work in it (as in this is ONLY a remaster and NOT a total remake whatsoever), and how I struggled with learning how to play a ~20 year old game with my modern mindset, on a modern console (and I'm not talking about translating the original mouse movements to a PS4 controller – I actually found that was pretty darn seamless and smooth). This wouldn't bug me as much if they didn't keep talking about "quality of life improvements"... and I call a big bullshit on that. Sure, you can auto-pickup gold, that's cool... but what about being able to, oh, I don't know... FUCKING PAUSE THE GAME????? Yeah, even pressing the Playstation button on the controller (my go-to method to pause ANY game, even mid-cutscene) doesn't work, you'll still get killed if you're in a dungeon because the game is STILL playing in the background. I've been able to pause ANY game I can think of all the way back to NES in 1985... Even "ESC" on PC paused Diablo II back in the day I was reading... The only proximity of a pause this game has is opening a portal back to town (which sometimes I don't have time to get out of a mob of monsters and make one), or literally you have to hold the playstation button and put the console into sleep mode... that's the only way.
There's really not a save/load system to the game how we think of them today either (ok, maybe since like 1988's battery saves...). It does technically save, but you lose ALL progress in the dungeon or area you're in (and some are HUGE) and all the monsters respawn and you have to kill them all once again... No save really fucks things up. Like try to figure out how the fuck the Horadric Cube works (sorry, my memory from playing this 20 years ago is non existent)... you use the cube by using items (runes, gems, etc.) you've sometimes literally been upgrading for 10, 20, 30+ hours to get them to be usable for a certain recipe... then if you fuck something up on the recipe or don't like the final item? ...you're shit out of luck because you can't load a previous save game and try it a different way. Can't even remove some of those same items you put into weapon/armor sockets either (well, you can, but it takes even MORE rare items to remove them... and you still lose the item you socketed).
I also had an issue where early in the game I evidentially wasn't putting my points into the right places despite sailing through all the regular enemies super easy... but I got to the first boss and as soon as I entered the room I died IMMEDIATELY. And I'm not even joking, in a split second I died. Couldn't dodge, run away, load a potion, launch a spell... nothing, just immediately dead... About 30-40 times in a row (oh, and when you die you lose EVERYTHING, all weapons/equip/gold/etc – until you can claim your body again... in the same room you died in).... Thankfully I googled and found that ONE TIME (per difficulty level) you can reload your stats and do your points again (which I did, and tripled my points to Vitality/Life so I didn't immediately die).
Don't even get me started about the game literally being SOLELY (ok, maybe 85%) about picking up loot and upgrading shit (by selling, merging items you find, etc.), then have a whole whopping ~24 slots in your inventory (a bow takes up 6x slots fyi, a large shield can be 8...). So if you're like me and can't stand NOT picking up everything in sight to sell, I'm transporting back to town literally every 5-7 minutes (not exaggerating... sometimes in the same medium size room with two groups of enemies on either side I'll have to go back twice in 2 minutes or so... it's that bad).
Anyway, somehow still really enjoyed the game. Used to play it all the time back in the day, it's just that I was expecting a bit more out of a game, even if it's re-released as a remaster and not a remake of a game (even if it's based on the same original engine). I totally get it's just upgrading the graphics essentially... and my comments still hold true even if I was talking about the original 2000 release, but some of these complaints I have are nearly inexcusable in a modern game (like seriously... at least give me the ability to pause the fucking game... an actual save system would be great too).