It depends on what kind of a teacher you get and whether he or she makes your life miserable or not. I had fun in kindergarten, then got accused of something in first grade and got punished (unjustly) for it. I hated her for the rest of the year. Second and third were okay, then our class jumped from 3rd to 5th, I ended up with the crabbiest teacher in creation. She picked on me for everything imaginable, and her favorite phrase was, "How you got to fifth grade, I'll never know!"
Oh, how I longed to tell that old bat, "By double promotion." But I had the feeling such an answer wouldn't be welcome, so I never did.