I used to be a big fan of Relic games. I owned COH1, DOW1 and DOW2. I stopped being a fan of Relic with COH2.
My very strong concerns and issues had to do with balance. Not IMBALANCE - that is a separate issue. But wrong balance, dumb balance, unimaginative balance, uncreative balance, and finally, lazy balance. To illustrate, let's say I give 2 different factions 10 different units each in their unit rosters. But let's say that in order to make my job much, much easier in the balance department, because I could care less about fooling around with balance, I nerf 7 out of 10 of the units in BOTH rosters so heavily that only 3 viable units remain in each roster. Well, the game is 'balanced' meaning both sides have equal chances to win, all other things being equal. But it's not a game worth playing, and the players have been robbed, thinking they have 10 unit rosters when, effectively, they have 3 unit rosters.
I could give example after example, but let's take the German flame-throwing halftrack from COH2. Sounds like a way-cool unit, right? But they didn't want to fool with balancing - too much time, too much effort, too much trouble. So they nerfed it to the point that nobody used it, ever, at least not in a meaningful way. Oh sure, you could build one for laughs, trolls, etc. But it was a nonviable unit. Whatever use you might could find for it was ridiculously niche.
This pattern happened over and over again, whether it was the King Tiger, Sturmtiger, etc. The pattern was to nerf most units - especially "exotic" or interesting units, or units which might provide an interesting mechanic - down to the level of being either nonviable, or just being "blah" or "vanilla." This was purposefully done so that Relic only had to worry about balancing the same "bread and butter" type units on both sides (basic infantry, etc) and not deal with anything else. So, my friends and I quit playing after the British and OKW factions were released, and didn't buy any more expansions. And we haven't bought this game.
I would urge the player base to watch out for this tactic by Relic, because they will absolutely try to pull it off again, if they aren't already doing it.
One more thing to watch out for, which is similar to the phenomenon described above - "nerfing" or "blanding down" interesting racial themes or mechanics down to the point at which they are just dumb gimmicks which don't affect core gameplay. I already see evidence of this happening now. For instance, the racial theme of the Eldar being the enigmatic, elusive, cloaky race with teleporting buildings, teleporting units, cloaking, hit-and-run, fleet-of-foot, blah blah is quite watered-down. What you really have, instead of a true racial theme, is a couple of cheap bland gimmicks which don't really affect gameplay because the racial theme is purposefully overnerfed so that Relic doesn't have to fool with it as a balance issue. The goal is to convince the player that the race feels and plays fundamentally differently, when in fact there is only a cheap, thin veneer of a true difference. For example, building teleportation seems to be pretty much a joke, with the long cooldowns and what not.