The thing is (and I've said this elsewhere, but) it seems to me that the person making the list enjoys MOST of these movies on an ironic level. They even claim Gojira has "cute charm" (or whatever the actual direct quote is) and then proceed to show the scene where the mom is trying to calm her kids as a wall of radioactive fire bears down on them and will soon cause them terrible agony and death. Yes, VERY charming.
I'll admit that at least half the movies in the series are ironic fun stupidity, but I also get irritated when people can't bring themselves to admit that at least a few of the films are actually GOOD despite not having high-dollar effects.
I also take umbrage with two 90s films making a top 5, but honestly, I've seen worse lists. In fact, you could more or less take this list and add in one of Jun Fukuda's better films and give it to somebody and say, "Watch these movies and you'll have a solid idea of everything Godzilla has to offer."