This is especially annoying since Ash never even learned HOW to use Torterra properly and Paul never used his in the league. So basically no good Torterra representation.Of that list I think Torterra is the only one that we can actually decisively say was outright made worse than its own pre-evolution. Ash's Noibat literally never battled while in that stage (the closest he ever got to battling as a Noibat was dealing some minor chip damage to a Flare Admin's Drapion), so it's a huge stretch to say that it was outright worse as a Noivern. Meanwhile, Kingler only battled once as a Krabby, so of course it's gonna get more losses in its Kingler stage, since that one's the one that got to see more action, also keep in mind that the vast majority of Kingler's wins were achieved as a Kingler, so no, I don't agree with the notion that Krabby was made to look better.
Torterra, on the other branch, got its absolute worst battle performances during that stage. Even as a Grotle it already had numerous losses, but at least it still got one win against Candice's Sneasel. So yeah, not only was Torterra made to look far worse than its pre-evolutions, but it was straight up a downward slope: fantastic as a Turtwig, weak but still with a few accomplishments as a Grotle, a complete jobber as a Torterra...