I'm torn, on one hand I kinda love the core rules, the Universal Special Rules for weapons and datasheets was a much needed change, and on the whole i like the datasheet abilities and the way fewer Strategems.
On the other hand I have serious problems with the index's, the lack of flavour for some armies is depressing (my poor Blood Angels) and they really over did it on the consolidated weapons profiles, I can deal with power Swords, Spears and Axes all being a single profile, but Power Fists, Thunder hmmers and Lightning Claws should be different, and dont even get me started on what a fustercluck the Comi-weapons or VanVets "Heirloom Weapons" are.
Then there's the Way that they've split up datasheets, they should have gone with the way they do characters in 2nd edition 30k and have just a single profile for a type of character, with the option to just take Terminator armour, a bike or a jump pack as additional war-gear, with the stat changes/abilities that they provide being in the armoury page.
And that brings me to the points system. I cannot stand the reskinned PL that we have masquerading as points currently, I want to go back to paying for War-gear and having any squad size increment that I wanted. I did actually play with PL a good bit in 9th with Crusade, and it is so fucking easy to cheese, even in friendly fun matches, Its going to be so much worse going forward unless the codex's fix it.