I don't want to formulate too strong an opinion after one day, but I feel like balance is pretty good for day 1. Balancing 4 factions couldn't have been easy.
I personally really struggled with Americans against turtling Wehrmacht players in 4v4s. The US is seriously lacking in indirect fire, unlike the British, which makes no sense given real life US doctrine. All your artillery options to deal with turtling are locked behind doctrines (and even those aren't particularly good) or the air support building. Mortars do surprisingly shite damage against bunkers, and the AT halftrack sucks. Probably an l2p issue on my part, but I couldn't shake the feeling that there was very little I could do against a big line of defenses.
DAK feels quite strong if played well.
Having played all factions a decent amount, I can say that USF is the only one that feels like fighting a constant uphill battle with a massive handicap in 2v2-4v4.
Indirect fire is obnoxiously bad as you said, and brits seem to be superior in every single regard except mech center upgraded Hellcats and esp. Shermans, those are absolutely nuts