It's hard not to notice the trend of people saying that they're feeling overwhelmed, they don't know what they're doing, they don't know how best to use their units.
The manual isn't immediately obvious to find, and was accidentally removed from some releases of the beta. It's also not completely obvious that you can play against "No AI" to see what units do. Some people jump right into the deep end and are expecting to have their hand held.
I'm past that stage and onto "maintaining a spreadsheet that keeps track of the balance tweaks between beta versions", so I can't really comment on whether more information is needed.
Forktong commented that Larian really "
need to get a guide out quickly that shows off all the unit types, and skills, how they counter each other, how they can be combined, etc."
I know that comparisons to Starcraft 2 may be a bit unwelcome, but that game did make a point of giving each unit a brief introduction when it first appears, and introduced them one at a time. However, that game used custom maps and custom enemy unit mixes specifically tailored to show off the strengths of the unit they were introducing, so that exact system isn't going to work in Dragon Commander.
There's also the trick that unit roles are changing slightly. Just the other day, Warlocks Cloak was switched to any ally target, then back to self-cloak only, and casting distances were increased, and farther back, Shamans and Warlocks became water-traversing units. When things are changing that much, it may not be the best time to shove a guide in.
How many people here want that guide to be an in-game tutorial on how to use unit types? Do you think that would help people get into the deeper side of the RTS mode more and push blobs less?