While it was initially a Cat 5 off the coast, it was a Category 1 hurricane by the time it reached Houston and degraded to a tropical storm before actually leaving Houston. As much as I'm willing to recognize that severity is relative, if any city in Florida lost power as completely and for as long as a result of a Category 1/tropical storm, they'd be ridiculed into next century.

And of course this isn't a one off event for Texas either. This is a symptom of a much larger systematic failure of the state's energy grid (which notably isn't connected to and refuses to coordinate with any of the other state grids).