Instead, it would make more sense to rate PrCs by how much advantage they give, over their 'logical entries'. Still, ranking them that way is merely repeating the obvious, that some base classes are better than other, down through the list of PrCs ad nauseum. Soulbow certainly adds more to Soulknives than Mindbender does to Sorcerers, but I think most will agree that a high level Mindbender will still beat a Soulbow with both arms tied behind its back. We should only list a PrC multiple times if the multiple entries are all simple and straightforward given the requirements, as anything else falls under the individual's optimization skill.
Where the difference between two 'logical entries' is huge, those entries can be listed separately (see Rainbow Servant), but just like for base classes, a single PrC can go up or down based on optimization skill, and we should focus on what we see as the 'average' use. It's obvious that some provide too much and some provide too little, but which is which depends on a lot of factors - base class entry being the most obvious.
