I Dream of Twilight modblog
I actually disagree with how Secret Of My Excess is considered to be the best Spike-centered episode in the entire series. That's because, while I still consider it a decent episode, in my opinion, the biggest problem I had with it is that, it rarely showcased what makes Spike such a great character, and instead focuses more on the flaws of his character (such as his inherent greed). Unlike "Inspiration Manifestation", in which that episode instead focuses on showing what makes him work overall.

Yeaaah in terms of Spike’s portrayal in the episode. Secret of my Excess isn’t the best because most of the episode Spike is being fueled by greed that seems to be dragon natural instinct. But I don’t know, the moments he is not fueled by his greed. Like giving his heart ruby to Rarity, and when Rarity makes him return to normal with the same ruby.

But I don’t know I feel the rest of Secret of my Excess is just too entertaining, even if Spike himself isn’t quite the best he can be. Twilight shows care and worry for Spike when she takes Spike to the doctor, Pinkie’s reaction to Sugarcube Corner getting destroyed is priceless, Fluttershy and Rainbow being Good Cop, Bad Cop is hilarious, and plenty more. ^^

It’s just personal preference. If Spike’s portrayal is the #1 thing then Inspiration Manifestation is probably the best Spike episode. But It’s not a bad thing though that Inspiration is only #2. I feel Inspiration Manifestation, Secret of my Excess, and Power Ponies, and Just for Sidekicks are the Spike episodes that are legitimately good or enjoyable. I’m not intending to say Inspiration is bad, just I liked Secret of my Excess overall more.