Lets muddy the water some. Once you leave the PH1
Let's not. The accusation was leveled the moment the PH1 was out, and it was refuted, from the PH1. Case closed. It was false - most charitably, an example of ill-advised or ignorant hyperbole.
When we go behind the hyperbole and look at the remaining claim, the one you repeated, above, that the /presentation/ made powers merely /seem/ samey, you have a much more subjective, and thus not strictly falsifiable claim.
But, it's, once again an inconsistent one, because many things in D&D have been presented in the same format, before, without complaint.
So I'll adjust my statement: Fighter Powers are indistinguishable from Magic because they are written up using the same format as Magic.
Just for one of many possible refutations: No fighter power is subject to Dispel Magic.
But, rather than circling the edition war merry-go-round of proving your statement false, and you re-hashing it in a different form in the hopes of finding one power it's true for, let's take a huge leap, and assume, for the sake of the current discussion that you're right. That Fighters actually do have plenty of implement, area, powers that create zones doing typed damage that can be Dispeled, and that some of them even have the same names and exact same write-ups as some other classes use.
Two classes or more sharing abilities that have the same presentation, same name, and same mechanics, are nothing new to D&D, yet they've never led to calling those classes 'samey' before, or since - with the sole exception of the Sorcerer & Wizard sharing virtually identical spell lists, which caused a pretty minor stir.
And, we are left with another of these preplexing inconsistencies.