Withdrawal
At past, you had three options of withdraw:
1. Low - 0.0002 btc
2. Medium - 0.0004 btc
3. High - 0.0006 btc
On high priority, the withdraw and confirmation was almost instant. Seems, now they left only two option and I agree with you, today these fees are very high. I would love if they offer us lowered withdraw fees and more advanced withdraw options where users will be able to set custom satoshi/bytes fee.
Promotions
Their promotions are really amazing, I can't really understand why you think it deserves 0 out of 5. They have a lot of promotions, chest rewards where you can get good reward if you are lucky. Also, I can say that at past Baryom was paying himself 1 bitcoin and sometimes more to top players, yeah, he was giving them 1 bitcoin for free as an appreciation for being a loyal customer.
KYC and anonymity
Bitsler is really one of the great casino that doesn't ask for KYC documents unless there is very, very bad situation. And you can stay pretty anonymous with them but maybe because of email, 4/5 in anonimity is still okay.
Still, I think Bitsler really deserves 5/5.