Sorry for double post, but after playing the first campaign level I can see why Stormgate is attracting negative steam reviews. The first level of the Stormgate campaign doesn't play like a RTS, but rather like a point and click adventure game, and as point and click adventure games go, it's really bad.
Basically the developers waste a level having you move individual units around without ever having you deploy a base to deploy them from, and they don't explain, when they teach you to move the units, how to move the in-game camera. For RTS reasons the units and the camera aren't automatically locked together, but in point and click adventure they usually are. So I ended up using the arrow keys to move the camera instead of the mouse with the scroll wheel, which was tedious and annoying.
And then you're just moving and moving and moving, and all you get is a few data pads, a few enemies, and a deer until you run into something else on the other side of the map, with less story content that a point and click player would expect - the level feels open and unfinished. Some of this poor experience can be put down to newb clumsiness, but I can see RTS veterans getting mad that they can't play a "real" level. Introducing more RTS game mechanics and story content in the first level would probably help with the negative impression that they are getting.