The power abilities need to be massively changed. A friend and I hopped into a 2v2 on halo wars 1, to get a nice bit of relaxation (too many things are going on in halo wars 2, two types of resources is too much and you end up having far far more power than you actually need once you have built your bases).
A few things we noticed, the power of units in halo wars is far better distributed than in halo wars 2. The mac blast in HW2 can barely even kill a warthog, let alone marines this is just silly as even a rock hurtling down from space would destroy a car! Grenades in halo wars 1 when one group of marines through them, nearly destroy a warthog which makes sense because that is what would happen id you had 4-5 grenades thrown at a warthog in halo 5.
The Banshees in Halo wars 2 are completely and utterly ridiculously over powered, in HW1 banshees are superb, they are fast and nimble but when confronted with some wolverines they are destroy rather quickly, this makes sense anti air vehicle destroys air unit, check. But in HW2 you have an army of banshees who meet an army of wolverines... and well yeh the wolverines get obliterated because the fuel-rod cannon on the banshees is insane, and the wolverines are nowhere near strong enough against banshees. If you then pit a HW1 banshees against a Hornet it is more or less even, with the hornet winning, but in HW2 the banshee destroys because you have given them a massive air torpedo, basically joining the banshee with the vampire, an air torpedo has never been seen in halo coming from a banshee, so why bring it in and mess up the units!
When the brutes do their jump, and you have the trephine ability bought this is insane, and so fun but you can see that it incredibly op, if you have 30 brute jumpers, who jump across a battlefield with that you will lay a fortune of explosives enough to kill an army of tanks. On that note whilst playing a game of deathmatch just now, my friend and i both had big armies of tanks and hunters, the others had wolverines and grunts, we all met at once in the centre of the field, this would normally be an awesome battle, with the odd mac blast coming in, and a disruption bomb from stop[ing the covenant leaders doing their power, but here we just had one person use close air support, then the other two using eradication, and the final one use another close air support (CAS), kill 320 units worth of troops in less than ten seconds. This top power is brilliant but it needs to be made that a single point on the map (maybe two) must be controlled to use the super super power or eradication or CAS, else it just becomes silly as it is so easy to get them as well!
The scale of the units is also completely wrong, the brutes and grunts are huge when the vehicles and buildings are tiny, the scaling in HW1 seemed nigh perfect, but something went wrong with the sizes. As well as that the artwork and styling in HW is much nicer, better deeper colours less vivid and more detailed (i know its a beta and this will change), the art style was brilliant in HW1 so no need to change it!
I'll likely post more later on, Ta Ta for now.