From reading around the Web it appears that Sanctuary fandom is split on Kate. A lot of people can't stand her and just want her gone. I didn't really care either way until recently, like this episode, when I realized she isn't even doing a good job of being eye candy. She's just there.
And it's not that people are clamoring for Ashley to come back, they simply want Kate gone because she doesn't fit. She might have been okay for an episode or two but making her a regular was pointless. She has become an irritant by her very existence and needs to be dealt with accordingly, such as being devoured by an abnormal and then pooped out. They can make it an episode where Helen discovers Kate's remains amongst the abnormal's feces and goes about reconstructing what happened. In the end she'll discover that Kate was just one big annoying grain of sand in the vagina of the abnormal so the beast was more than good with getting rid of her. Now that's an episode I'd watch!
I guess people are going to have differing opinions. Kate in Season 2 was annoying at times. However she was fixed pretty well this season. They toned down the whole "street smart" aspect and made her a bit more feminine. And it worked great! I still chuckle when I remember her and the Big Guy watching TV together while munching popcorn -and both falling alseep.
This episode really was focused heavily on Helen, with the others very much in the background (although Will had a good part profiling and Henry was funny with his reactions to being exposed to all that advanced tech - classic nerdgasm). And even though his time on screen was short John Druitt really stood out - he was positively creepy and as I said earlier gave off a definite Hannibal Lecter vibe.
Tesla will be coming soon, and judging by the previews he is getting his "vamp" back.