It's contextual for me. Based on the time it was made. I agree with you, but if you look at say The Lord of the Rings...the distance between the video and the actual animation is huge.
I'm sure it is. I guess my point is that all the effort made tracing the live action video and turning that into painted cels and backgrounds could have been put into filming a better live action project and releasing an actual movie. Using the Lord of the Rings example, I have way more respect now for Rankin-Bass' Hobbit and Return of the King cartoons. Because while they're maybe less ambitious, at least the entire thing was made from artists imagining things and then drawing them rather than tracing already captured motion and acting.
The video game thing is a little different for me, since those are supposed to be interactive experiences, and the motion capture tends to relate to gameplay rather than storytelling.
Honestly, I lost a lot of respect for a lot of the classic Disney animated movies when I found out about their extensive use of rotoscoping as well. I did some rotoscoping work myself in my early 20s for a couple commercials (at a little independent studio a couple blocks away from the WB lot, working overnight, and the two other guys using the cameras were filming animatics for WB from Batman storyboards for what would become Mask of the Phantasm), and really, a monkey could do it.