Well, the bad thing about it is that there are TONS of characters. So, chances of getting non-rate-up character that you want is super slim. You have to pray that the character you want will be in rate-up later or hope that it will drop accidentally. How about that portion of despair?
Oh, another one is that even though it's possible to clear stages with basic 3-4* characters, you will have to use strategy and lose and lose and lose again until you either came up with the sufficient plan or understand the gimmic of the stage.
And if you finally got enough of that despair, just go on youtube and watch how some chineese guy beats this stage with 3* units while you bumped your head against it with a bunch of 6*.
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