The UI being different and the new systems being too much change is a lame point. A typical cant teach old dogs new tricks stuff. None of it change the core game - it's still the same as Dion.
Id love for UI to be like on c1, but that my preference and I dont expect this at all.
The only thing I dont like personally is the Random crafting - it makes little sense in terms of how much gear you need to savrifice and how small the rewards are. Even if Sano said that they will increase the reward grades over time its still a diminishing returns lottery that I dont think anyone will use.