In the 8th edition (unfortunately IMO), if an infantry unit has the option of great weapons, then they should ALWAYS take it. This is because the drawback for a large ranked unit striking last is minimal. For example, If you take a unit of 28 grave guard 7 wide, then you need to be taken below 10 to lose significant power. At this point you have just lost 18 grave guard so it probably means you were in a bad spot anyway. The same 30 unit (not 28 because they are a bit cheaper) of grave guard with hand weapon and shield would find itself probably closer to being wiped out since they would be losing combat by a lot more even thought they would save a few wounds. I have never seen a competitive dwarf list, for example, field warriors with hand weapon and shield, it just doesn't make sense.
As for our grave guard, since our initative is average (3), against a lot of armies we strike last anyway, so why not just add +2 strength for 1 point? We do lose our shield but we make up for that (and more) with causing more wounds. Not only that, but now monsters and monstrous infantry now need to fear us. They will kill a lot of us and we will kill a lot of them. With hand weapon and shields they still kill a lot of us and we can barely manage do inflict a few wounds.
I am personally very disapointed because it kind of takes the fun out of having to choose between an inferior and superior choice. For balance reasons, I think that great weapons should cost 2 or 3 points. Then it WOULD be a real choice, as one choice would be better but significantly more expensive, now it is a no brainer. I am glad that in our new book they made skeletons get free spears because in 7th ed it made no sense to pay an extra point for something that would usually be inferior.
Lest anyone think I am power gamer, I always run a grave guard unit with hand weapon and shield and a skeleton unit with spears just because I like the way they look. It just annoys me that my H&S grave guard lose to my opponents dwarf warriors with great weapons, when I could easily make my grave guard win by just adding great weapons....