My ranking is:
a) Getting rid of Account Siphon
b) Getting rid of Yog
c) Getting rid of Noise
d) Getting rid of Parasite
e) Adding in Swordsman
I could do all the changes but thought this a good start.
The Core 2.0 changes affect the game more than you would expect with the number of cycles out. Basically, the toxic things like non-interactive decks and also having penniless Corp players took a big hit. In a way, the blow of losing Jackson Howard has been lessened by also killing a fair amount of the stuff that made him so necessary in the first place. Another plus is the Core set is now a better and more balanced play experience in and of itself, which will help in attracting new players.