Picked this game up yesterday, and have put a few hours into it. Some impressions...
After the obligatory "become comfortable with the controls" phase, I can honestly say that it is in fact a riot. Micro-managing can be awfully satisfying at times (like targeting my Missile vets on a pesky gun ship and watching it go down in flames a second later), or stationing two heavy tanks at choke points at opposite ends of the battle field, and switching back and forth to wreak havoc in multiple places at once. Four hours in, and the controls have become all but transparent. It's fun just driving (the vehicles' controls are reminiscent of those in Halo) or flying around; you could almost forget there's fighting to do.
It's also interesting, while your allies' AI is respectable, how much of a difference you as the player make on the battlefield with seemingly small or insignificant choices. Your choice of unit (light tank or gunship?), your choice of where to tell your troops to guard, whether you take all your troops at once or form an expeditionary force, etc. all have VERY significant effects on how your troops will have held up at the end of the day. It was sometimes surprising how quickly I could lose a mission if I wasn't careful about my planning. Luckily, any frustration this caused was greatly overshadowed by the "Ahh, if I do it THIS way, I should fare better - ok I'll try again!" feeling.
Besides the challenging/addicting gameplay, I'm finding myself further drawn in by the parallels this game runs to the Advance Wars games - the presence/mood brought by the COs, end-of-mission rankings, and especially the unit checks/balances. This game very much belongs in the "Wars" family, even if it's a (slightly) different genre. The number of similarities surprised me because some reviews have downplayed, or at least not elaborated much on, this relation. But it makes the game feel cozy and familiar, even if the gameplay is different - pretty cool, since I loved the GBA entries in the series.
Thus far, I'm decidedly impressed - no lingering regrets about the $50 price of admission here.