I personally like the rules
IMO, as it means you have to think a lot more and tactically position your vehicles. Plus, if your that worried, try to prioritize who to kill, so you get the most dangerous enemy units out of the game before they cause too much damage

.
As for a specific army tho, i would say be careful with Crons

, as their Gauss ability to always glance on a 6 is rather pesky, and Necron Scarabs can strip armour off vehicles pretty easy, but dreadnoughts are good to cope with that, because with a Strength 6 weapon you can instakill them or use templates to do double wounds, as the Scarabs have a Weakness to Template/Blast.