These are some of the comments that have me worried about Halo Wars >

Nate Ralph:

tells the story of the Spirit of Fire, a massive United Nations Space Command warship

Since when is an overhauled colony ship a warship? I doubt it's a warship...

Nate Ralph:

The drawback is that there aren't as many units on the field. While you can increase the number of units you can place on the map, I hit the limit at about 60. Every large vehicle, like a tank or a gunship, counts as three or four units.

Having a pop cap of 60 is pathetic.

Nate Ralph:

The system works great for the single-player campaign, and complements the console's control scheme, but many strategic elements are lost along the way, particularly with the game's multiplayer skirmish modes.

As I have been saying...

Nate Ralph:

During my hands-on time, we only played on one multiplayer map. Once I learned where all the base locations were, there wasn't much opportunity to be surprised. Both the UNSC and Covenant races had a unit that mitigated this drawback, allowing you to deploy units anywhere on the map, but it still doesn't quite have the punch of constructing forward bases, or starving opponents by cutting them off from crucial resources.

This hints at a loss of re-playability.