I didn't forget about Worf (nor do I discount O'Brien's and Keiko's presence as persistent familiar faces).  Worf seemed to be more a matter of a popular character, who had seen a fair amount of growth on TNG, being given a proper new chapter on DS9.
Does this shrink the Universe once again? Perhaps. But as mentioned, Worf was a character that did fit the DS9 dynamic rather well, and his presence was not simply a case of a singular ratings-grabbing event. His introduction was made plausible and his appearance, to me, was welcome.
	
		
			
		
		
	
				
			Does this shrink the Universe once again? Perhaps. But as mentioned, Worf was a character that did fit the DS9 dynamic rather well, and his presence was not simply a case of a singular ratings-grabbing event. His introduction was made plausible and his appearance, to me, was welcome.
				

 Yeah, "Dax" is average. It's not great, it's not terrible, but it is watchable.