I enjoy the combat system, but can see why it isn't to everybody's taste. (Hell, I can't stand the Diablo combat system)
With this in mind, the first few hours of Baldur's Gate 1 are among the most harrowing experiences in gaming if you don't know what you are doing. Doubly so if you are a Mage. By don't know what you are doing, I mean have not have intimate knowledge of DND second edition.
(In this respect, BG2 did a far better job... and even then it is very poor).
My first run though (many, many years ago), I didn't realise you could rest outdoors or in mines. That made life difficult. Indeed, when compounded with my ignorance in other areas, I still twitch slightly when somebody mentions kobolds.
So, with this in mind, why should you continue? Why is it great?
Well, once you get the hang of it, the combat system results in some great, complex, tactical battles. The story pretty good (sure, ain't Shakespeare, but night and day above the vast majority of computer game story lines). Memorable characters.
Most importantly, I have yet to play a game that encapsulates the spirit of adventure so well.
(In this respect I prefer the original Baldur's Gate to it's sequel.)
So, if you can, get out of Candlekeep. Get a few party members. Set off into the wild. You will never look back.