I wrote a brief rebuttal to Jen in the comments, that I'll also share here:
It was a good effort, but some of your points make no sense. For example, you used Anakin's duels with Count Dooku and Kenobi as examples of Anakin's shortcomings - that he is vulnerable to counter-attacks - but failed to acknowledge that during his fight with Dooku he was three years from his prime; three years that marked a time of significant developement for Anakin, in all aspects of combat. Did he get his arm sliced off by Dooku on the Invisible Hand? No, he did not. Instead it was Dooku who was deprived of both of his hands by Anakin.Similarly, in the Mustafar duel, Anakin and Kenobi were both in very specific positions when the latter defeated the former. It was entirely circumstantial, and in essence, a cheap-shot. Again, if Anakin was truly vulnerable to counters, then why didn't Obi-Wan manage to slice him to pieces during the actual duel? Probably because Anakin isn't vulnerable to counters, and Kenobi essentially conceded inferiority to him as a pure swordsman in the Revenge of the Sith junior novelization.
Lastly, you saying that (paraphrasing) "If Mace couldn't overpower Grievous, then Anakin can't either." is a fallacy. You do realize that the fight between Mace and Grievous was inconclusive and very short, do you? So that can't be used to conclude anything about Mace's supposed inability to overpower him. Second, you established no connection between Mace and Anakin, simply saying that if Mace can't do it, then Anakin can't either, basing it off of absolutely nothing other than your own word, and expecting the rest of us to follow your line of thought without extrapolating on it whatsoever.
Looking at their respective showings of strength, Anakin definitely comes out on top. Mace is roughly an equal of Dooku as a swordsman; this is stated in multiple sources and guidebooks, and as such, is an established fact. And as equals, they'd be relatively evenly matched in a lightsaber duel. The same cannot be said for Anakin and Dooku; the former was essentially dominating the latter, and broke his defence with just one strike, and literally bent his wrist on the second strike. I've seen nothing that would indicate Mace is stronger than Anakin, and their respective matches against Dooku definitely suggest the opposite. As for Grievous, Dooku was blocking his attacks one-handed, barely flinching, as can be seen from their sparring session in the microseries. This would suggest Grievous to be very much Anakin's inferior.
In my opinion, Anakin would overpower Grievous, or at least outfence him, just like he overpowered and outfenced Count Dooku, and would have outfenced Kenobi had the fight continued to be fought on even ground.
Also, the bit about Anakin not having demonstrated any energy-based powers is wrong: He used Tutaminis to deflect a theta storm in Clone Wars Gambit - Siege.