Well let me say this.. Mine is worse than that... It is coming down next week to get the spot level.
Pretty much everyone here will tell you that is TOO far out of level and I agree.
I have decided when I take my down to have the excavator come back out to do his job properly, "which he has agreed to do" to make it within 1 inch of level.
Then I was told by a pool installer to lay down #2 crusher with limestone as my base, to level THAT and compact it with a plate compactor, then to lay down the foam insulation sheets and then the pool on top of that.
But, my liner has not burst, the walls have not come crashing down, but I don't sleep well at night wondering if it might so I would recommend to take it down, get the ground nice and level and perhaps do what I am planning to do, not want you want to hear, but the folks here know what they are talking about.