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Initially, we all come to gambling with inflated expectations, and only after gaining personal experience (mostly negative) do we lower our expectations. Most likely, people who blame casinos for their losses have a gambling addiction. It is quite difficult to convince such people that they are the root of the problem, because their mental illness prevents them from understanding that all their problems can be solved simply by stopping gambling. In my opinion, such people need serious help, and the sooner the better.
Instead of blaming the casino for a bad gambling experience, I think gamblers should always be able to introspect their gambling decisions. Everyone comes to gambling with high hopes of winning, over time their mindset can change for various reasons. Those who blame the casino of course because expectations never match reality, but this is not the casino's fault, unless the casino comes with evil intentions.
I tend to feel guilty for any wrong decision, which is normal for me because it is basically very difficult to win every bet all the time. I never feel happy gambling just for money, gambling is not just money for me, it is a game that as far as I play it gives me the entertainment I need.