The random features seem a lot more complex as compared to Luckycoin.
Not really, it just sounds more complex. Functionally it's exactly the same as in Luckycoin with some different numbers plugged in. Which means that the exact value of each block can be calculated before it's mined, such that someone with a bit of know-how can easily set up their miners to only mine blocks with the high values. Leaving everyone else to fight for the scraps the rest of the time.
I've been hearing this since the Luckycoin. Yes JKC sucks because it used the block number as seed, which is totally predicatable before any computation. But luckycoin used the previous hash as seed, which is predicatable only if you calculated the previous hash. I don't see how in practical people can use this to get superblocks.
People criticized LKY and some claimed that they can get only the superblocks. I am very much curious to see anyone who can do this with a program, and not just talking in the forum.