I agree with your points about Kristin, and while I think she did a good job in the temple, I feel that she sometimes gets too much praise for her performance. She did have a relatively short and easy path for a Season 3 run, and she had a bit of trouble in the Shrine. However, her head-first dive in the Pit of the Pendulum and her consistent speed, in combination with the fact that it was the final episode of the series, may influence our opinion of this run.
Still, if we are to compare Catherine the Great to other similar Season 3 runs, there seems to be an unfair disparity in favor of the Catherine the Great run. Ivory Hunting Horn had an identical path, with the exception of the Shrine, but it is often stated that that win was "too easy." The Shrine was a room that could eat up a lot of time, but it was only one extra room and Yakerra would have had a minute to complete it if she had to reach the Ancient Warriors. Would Yakerra be a "superstar" contestant if she was forced to complete the Shrine to reach the Ivory Hunting Horn? And unlike Yakerra, Kristin didn't even complete all of the rooms in her path since Kris lasted until the Tomb of the Headless Kings.
Benzibab's layout has received similar criticism as Ivory Hunting Horn, but Annie and Kevin entered the same number of rooms as Kris and Kristin and had a faster completion of the temple. While it is clear that the Shrine was a more time consuming room than the Quicksand Bog, that was the only major difference between the two runs. I mean, Annie and Kris were even removed at the same point in the temple in the same amount of time. And the third guard was not encountered in either run.
Lastly, Jeweled Scabbard of Sforza has been called a good win, but a bit easy. Yes, this team only had to scale the central shaft en route to the Ancient Warriors, but even though that path was one room shorter than the Jewel-Encrusted Egg route, I would argue that it was equally or more difficult. The Jesters' Court had its fair share of dysfunction and the Shrine could trip up contestants, but neither room took a considerable amount of time. And the Dark Forest was a quick room to complete. The Chamber of the Sacred Markers and King's Storeroom, in my opinion, were a harder combination of rooms to have to complete back-to-back. In addition, the Jeweled Scabbard team found their half pendant (even though it was not necessary). Asher reached the Jeweled Scabbard with 48 seconds left and reached the gate with 28 seconds left on the clock. Kristin reached the Jewel-Encrusted Egg with 45 seconds left and reached the gate with 24 seconds left on the clock. In other words, Kristin was equally fast as (or equally slow as) Asher, who has received criticism for not being "quick enough" and should have had more time left on the clock.
Okay, so enough of my rant. I think that Kristin (and Kris) was a good contestant, but when we put it into perspective, she was on an equal playing field as the Benzibab, Sforza, and Roland teams.