I watched them back to back and I found neo-Khan to be not such a bad thing really. It's a more modern interpretation of the character. Montalban looks like a cheesey scenery chewer by comparison.
Some elements of Abrams Trek seem more sophisticated and thought out. Much of that stems from the benefit of 40 years to examine and contemplate the material.
Kirk "trying" to fist fight with Khan is a good example of this.