To argue Yuna was overscored at 2010 Worlds, one must look at where her scores were derived from at that competition.
Despite Yuna's 2 mistakes against Asada's one downgrade, Asada was only 0.5 point ahead technically. Also, 2010 was a year where GOE on triple jumps was worth a lot - and Yuna got deservedly high GOEs on the elements she executed well. On the elements she made her mistakes on, she was penalised fairly. The element scores were very well documented.
In relation to her PCS, I must say her free last year brought out a lot of her strengths (flow, power, speed, ice coverage, ability to incorporate transitions and into her difficult elements too) and hid her weaknesses (line). On the other hand, Asada's program made her skating look slow, bland and heavy. Her program was not as complex. She was also markedly slower than Yuna. So I am not surprised by their respective PCS scores. Their PCS score differentials rightfully narrowed since the Olympics due to both Asada's improvement and Yuna's deterioration from their Olympic performances.
Similarly, to argue Lepisto did not deserve the bronze, one must study where she got her points. 3-6th place was all very close. All of Ando, Phaneuf and Kostner beat Lepisto in the free. But Ando lost it in the short, Phaneuf lost it on PCS (and rightfully I must add even though I love her) and Kostner was already judged very generously given how she skated (3 faulty jump landings). Lepisto rightfully blew them away on PCS and caught up with Kostner with her superior components.
The more interesting thing about 2010 Worlds was how Ando's PCS compared to Yuna's last season, and then again this season at Worlds when Asada was no longer a gold medal threat but she was.