Iron Grip is another example of a game that is great, but multiplayer-focused with under-developed AI teammates to force people to jump into multiplayer (which is now, *drumroll*, dead).
The reason why I would not recommend this game is because the multiplayer is dead (which is understandable since it is an old game) and playing singleplayer is a frustrating experience at medium and above difficulty because of lack of Team AI competence. Enemy AI is not bad, they work in groups and try to protect their Generals, but Team AI is way too under-developed, they totally ignore the RTS part of the game and they don't do teamwork at all (except when it comes to repairing player's buildings).
Afterall the price isn't that high, so I would still encourage you to try this game out either solo or multiplayer, IF you have some friends who are willing to buy and play it that is.
Release Date: 5 Dec, 2008
Genre: Action, Tower Defense