Well, the game was already a masterpiece when it was out, only to be seconded by Planespace: Torment for some (not me). Therefore, the base quality is still there. The original game had beautiful 2d artwork used as locations and they held their eye candy to this day.
What needed work was the paper dolls, spell effects, the UI, screen resolution (original one only supported 800 x 600 and 640 x 480) and one of the nightmares: 64 bit compatibility.
The initial release had bugs but at the moment, this game is quite solid. The story itself is probably one of the best modules ever written for Forgotten Realms. The characters (original ones) are all quite fun in their way and the newly added ones somewhat blend in. Although, they are neither as interesting as the original cast (like Minsc, Edwin or Jensen) nor their voice acting matches the quality of the original NPCs. Still, they don't disturb you much.
I have probably played and completed Baldur's Gate 1, Tales from the Sword Coast, Baldur's Gate 2 and Throne of Bhaal over 20 times, modding them to the bone. Nowadays, I am replaying the EE and I am quite happy that it helped me return to an already favorite, not causing issues with my high end rig. I am already halfway through the game, saving Imoen, and wife laughs at me whenever she sees me mimic the NPCs and their war cries.
Now that Pillars of Eternity and Torment: Tides of Numenera are coming, it would be nice to re-visit this masterpiece.