I sadly know what you mean. Even though they didn't really study the issues in seasons one - three, the show was fun, exciting and humorous. But in season four, (which I couldn't even watch entirely) it turned all dark side, (am I making any sense?) the good guys felt like the bad guys (which, can be okay, but it wasn't written right) and if they wanted to go with that angle (which they apparently did), the show should have gone entirely serious and dealt with issues.
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