I do too at times. I never said him a great martial artist- merely he is among those who have inspired people to take up the art through public media.
Isn't that enough to consider something worth prospective merit. How many people can most martial artists say have been able to truly inspire people to begin. And further, that those people would stay with the art far longer than the general crowd who begin, and even get to 1st dan.
It may be laughable to some to consider the power rangers, but some of the most general reasons for joining, are from youngsters watching movies, and television, and desiring to be like that.
How is that laughable, when that directly leads to people actually worthy of being called master? I know one person who joined because of an anime show, and he's among the best martial artists I know, though he has grown remarkably from those youthful roots when he began.
Just because some mine join for asinine reasons, does not mean they do not become martial artists worth respective when they mature, and change their reason from wanting to be like those they see, and being the best they can be, through commitment to the art, rather than learning how to throw a kamehameha.