For me the difficulty was

1. Eh
2. Easy
3. Eh
4. Oh god why

For those of you who are already farming Ravana Ex then, yes, the first four floors of Alexander are probably easy. For us mortals it seems about right, especially considering there will be more floors in the future.

It took me all evening to clear Burden. People seemed to have trouble not killing adds next to each other and healers were probably not expecting the insane amount of damage flying around. From what I heard it was easy to clear this morning when all the cutting edge players were hitting up Alex but as the day went on Burden got trickier.