To add to what everyone else is saying, the combat isn’t the same in that it’s not turn based like you’re thinking. Fights involve everyone getting into a fracas at once and swinging, the game expecting the player to regularly pause to give specific commands. Also, in BG1 you start at level one which feels reeeeeally weak so fights will be quite difficult until you’re about level 3-4.
That said, I had a lot of fun with the game after I got used to it. Writing is the main star of the show and it’s quite good.