A treasure to behold
This game has more depth than the predecessor mainly because there is a separate armory where you can customize your arsenal. When selecting the next level to play you actually get to choose which mission you would rather enter. The missions you choose determine certain outcomes in the game. The game also looks very graphically pleasing.
It's a small wonder Blizzard took so many years to develop this. It is, as selected in the classification, "amazing". I would also add from that same drop down menu that it is a guilty pleasure and upon installing the game the first day all I could do was sit there and play. It sucked me in and as great games tend to do I lost track of time. If you're a real time strategy lover, you must pick this up. If you are looking to delve into real time strategy for the first time this is the perfect place to start.
Go buy it now. You won't regret the extra $10 to purchase it. Really. You won't. It's not possible.