Honestly the Land Raider Achilles all by itself spoils virtually all the fun. I don't care how much it costs, there shouldn't be a vehicle that is virtually unkillable by a good portion of the armies in the game. If it was unarmed, I'd say it's maybe balanced, but with a fantastic set of guns AND nigh-invulnerability, it's just too OTT to allow.
Most of the other stuff is pretty tame compared to its codex counterparts, but nearly all of it is clearly designed for Apocalypse, where OTT is the name of the game. Lance/Melta immune Land Raiders and AV13 Stormravens are not so cheesy when Strength D and super-heavies are rolling around the table, but they're just not balanced for standard games of 40k.
Besides, you guys REALLY don't want me playing Armoured Battlegroup. You will learn to rue the words "Slick Loader" and "Ace Gunner"