It's really similar to traditional DnD RPG but with some extra quality of life built.

• you no longer needs to press stat roll for hours to get the stat you want. It's a bit more modernized but use the 5e rules(I am not familiar, just read it from others' comment)
• the opening(I am about 4~5 hours in early access content wise) and think the pace is actually quite good. party size is 4 instead of 6 in older games.
• there could be more QoL change to the camera operation as currently there is only limited freedom when you operate the camera around. I understand that you can venture out of visible area(so you can't peak into area you haven't get close enough yet), but lack of free looking sometimes make navigation around tight corridor/cave area with multiple levels a bit tricky. (they can probably allow free look but use fog of war type to block/masking out intractable/enemies)
• That said, even in the early area, there might be some glitches for events, how the game loading stuff, schedule tasks in weird order. ie. in one of the main sequence, it loads the map and play cinematic at same time, BUT, the map finish loading first and you see the "result" of the cinematic before it cuts in and started playing. So definitely don't expect it to be bug free, especially with the scale mentioned in the press.
• It's probably gonna burn you quite a bit of time before you get comfortable with the system, I don't know how far into the game to allow you respec the character( it was mentioned by larian to be a feature but didn't know how it would be implemented), so you might play some hours and decide to restart if the respec feature is only available mid/late game to have a smoother run or challenge higher difficulty.
• some of the keywords or system might be a bit confusing but fortunately there is wiki for BG3 already form years of early access.(which also mean it may or may not be out of date because of the patches)

I think overall I can look past the short coming and enjoy the game so far, no annoying crash or very flow breaking stuff. You do need to save frequently cause the auto save spot could be far apart. Best to save before you run into group of dots on your map AND after you finish a bit fight + short resting. The reason for this is this game does have trigger zone and you can't save during force triggered conversation/combat. If you forgot to rest it could put you into serious disadvantage(cause the high damage output spell or special skills are locked behind consumable points which only refresh after a long rest, and some events might be time relevant, so you have to weight your risk for proceed without rest and more rest but make your schedule tighter.(judging from a bit of search, it's event related, if you trigger a start of event but then go do other stuff the event will resolve itself even if you did nothing and long rest.)