Petroglyph are an ok developer. That seems to perfectly describe my feelings about their games.
"Universe at War" probably has the best factions and ideas, but unit supply is so limited that not a lot of approaches actually work (just 10 hours with Skirmish mode though). I found "Grey Goo"'s unit design a bit boring and was kind of weirded out how much they focused on having a cinematic story. It works, but never really felt inspired in any way. It's also surprisingly bland visually. Not just in regards to unit design and looks, but also as far as the landscape is concerned. Still rather high hardware requirements. "Forged Battalion"'s faction building system basically just encourages the player to unlock everything and then use the "best stuff" so to speak. Otherwise it was fun for some hours to try around with specific builds, but imho the trade-off isn't great. After all, there is no faction system, so everything feels very generic. On the other hand there are not enough faction building options to really be able to hone in on a particular idea.