How have they changed Kuble? The way I see it it is just for harassment and capturing cut off points and the DPS is abysmal. What you think?
The DPS of kubel is actually very good for such a cheap and early unit. It works best in combination with sturmpios who can repair it. Kubel is fast so if you also have infantry nearby you can always flank enemy cover position with the kubel increasing the dps of your forces greatly. Some top players even spam kubels and it is considered abuse by some players. One additional thing to note is that you can use kubel not only to cap and flank but also to push enemy infantry out of cover with the vehicle itself. It is especially effective when closing in with sturmpios at the same time but mind that some players consider that as unfair advantage.
As for ostheer, I don't think you should care about that faction being considered UP. You can use them with great sucess in automatch, where your opponents are always around your elo. Just don't use them in tournaments and you will be fine. As for strategies, sniper is still absolutely OP. Stug and pak40 are still amazing. And don't forget about flame ht in urban maps or against simcity. Pretty much the old stuff works fine as this is the faction that changed the least. I find myself pretty well in sniper into grenspam build recently.