IG is basically just throwing WWII tech into a Starcraft fight. So of course they have a lot of stebacks, but if you use them right, they can hold their own. Btw, our guys in teh field now? guns, guns, guns, tanks, guns, tanks, more guns. Most army guys don't try getting into melee if they can help it. And if you need to shield against melee, Ogryn. I had them hold off three groups of Orks while the squadmen gunned em down. Worked just fine.
Not saying that all other groups suck, just that I'm perfectly comfy with IG. Space Marines give me an easy start and finish (unit cost aside) and Necrons are super-duper easy to use when you know what does what. Even Tau, when I focus on snipers and quick strikes, kick a lot of ass.
So yeah, it's a mixed bag.