I'd ditch the ranger for the same reason they ditched the gnome: It has been a class without a niche for 3 editions so far! Plus, with one martial striker already in the bag, a second one is a little more redundant than an arcane striker.
They found a niche for it, sure, but pfft. They found a niche for the gnome, too, and that didn't get the buggers PH space.
But seriously, this is a poster child for some of the 4e schizophrenia going on there. "We don't want people to depend on the cleric, so there needs to be two leaders...however, we don't care if people have to depend on the wizard for 2 months until they shell out another $30. NO SYMMETRY BLARGH."
Including the druid as some sort of "terrain/weather/earth/air cleric-type controller" would have been a good thrust of it, even if it means ditching wild shape mostly. Druids make walls of thorns and swarms of bugs and clouds of fog and, for damage, rains of acid and spontaneous stampedes of phantasmal bison and surprise pits underneath your feet...
I wouldn't say this is my biggest complaint, but it ranks up there with "No Useful Index" for me, 'cuz it makes the game less usable.