I come from a DotA background so that is partially to blame for this post. I have been playing DG since it launched and had my fair share of dissapointment/joy with the game but one thing that I have noticed lately (or for some time now I should say) is that the predominate strategy in the game is to stack HP to massive amounts.
I say this because I see it done with EVERY DG. It doesn't matter which one it is, everyone has 5k+ hp because it is really the only way to go. The reason I think that this has happened is because although DG has some very nice strategical elements, like flags and varying skill trees (which DotA had neither) the one thing it lacks is a strong diversity in its items. What I mean by this is that in DotA you had Strength/Agility/Intellect heroes, each with their own unique powers but each also had a general theme because of their type. Some heroes you would stack massive amounts of HP on and that was great because they were tanks and some you would put massive amounts of damage dealing items on, or lastly some would have control items.
DG has very few control items (disables mainly, but also items that affect skills, etc.), things that give you a short teleport is about the only thing I can think of (there are a few others, but nothing outstanding that I can think of unless I am missing something). Then, on the damage dealing side it seems that although there are weapons that increase your damage that the cost to benefit ratio is not nearly as high as with HP items so there is no incentive to buy these over more HP. There are some items that give insane damage in the artifact shop, but those items come so infrequently that they are hard to get and because the item system doesn't work like DotA where you build items into more powerful items then you end up itemless until you actually buy the expensive item (whereas in DotA where you get the benefit of each of the weaker items until you can upgrade).
Long story short, I would like to see the damage items beefed up so that they could be considered as a viable strategy. I would also like to see more control type items added so that there would be yet another viable strategy.
Maybe what I am saying is not true, but from all of the games I have played recently it sure seems to be. Hopefully some more skilled players can either confirm/refute what I am saying.