I think Power Levels are a clear sign of who is physically stronger. That much seems to be fact. However, there are more ways to win than just strength.
So while I have nothing wrong with using Power Levels persay, I do believe that we as the readers can in no way properly understand the scaling for Power Levels to determine the maximum potential a character can reach. For example, we don't know if Power Level is a gradual linear increase, or if it's an exponential increase, or even if the scaling system completely changes when one reaches a certain level. So if Power Levels are clearly given for two characters, I believe it's definitely fair to state which character is stronger. However, that does not mean they will necessarily win (but in a series where the characters only really use Martial Arts, it's probably gonna be the stronger guy).
Now, if a character does have a Power Level given, and another character has a Power Level given for their lower form (say it shows Base Goku), I don't think we as the readers can use our information of Super Saiyan giving a specific multiplier to the Power Level.
And in the end, I want to emphasize that these Power Levels merely show who is STRONGER, but not who will win. I also want to emphasize that we don't know or understand the proper scaling, so we can't assume.
So while I have nothing wrong with using Power Levels persay, I do believe that we as the readers can in no way properly understand the scaling for Power Levels to determine the maximum potential a character can reach. For example, we don't know if Power Level is a gradual linear increase, or if it's an exponential increase, or even if the scaling system completely changes when one reaches a certain level. So if Power Levels are clearly given for two characters, I believe it's definitely fair to state which character is stronger. However, that does not mean they will necessarily win (but in a series where the characters only really use Martial Arts, it's probably gonna be the stronger guy).
Now, if a character does have a Power Level given, and another character has a Power Level given for their lower form (say it shows Base Goku), I don't think we as the readers can use our information of Super Saiyan giving a specific multiplier to the Power Level.
And in the end, I want to emphasize that these Power Levels merely show who is STRONGER, but not who will win. I also want to emphasize that we don't know or understand the proper scaling, so we can't assume.