To sum up in the neatest most eloquent fashion, Vader has fought better opponents, with better levels of success and has strength enough to break shaak ti in half. There is also that whole idea that Shaak ti is a bit of a poor choice for vader, since while nimble, even Maul was unable to leverage that speed advantage in his fight with Vader and to argue Shaak ti > Maul can be countered easily. Applying this knowledge to everything else means that Vader being > Felucia Marek means that even if shaak was > marek, it doesn't bridge the gap.
Vader scales above Felucia Marek by vast amountįelucia marek though losing was having a fight with Early Marek, which means they are on the same tier. Shaak ti being anything more than a nuisance is not even an argument.
