Personally I find this result very successful - In terms of gameplay many improvements that make it much more fluid game play (selection of the army with F2, displaying the number of drones needed on the hatch ...) - The overhaul of BattleNet is very successful and the leveling system is much more addictive than before - Finally the campaign is really addictive, ingredients that worked well on WoL were taken with a leveling Kerrigan system which gives a very fun side missions However, I regret the ease with which the campaign is finished (no challenge difficult), the life of the game (20 looped missions in fifteen hour), and much less than WoL dug scenario.
I wish I could spend more time to the relatively expensive price of this extension (40), but it's still very good :)