Fair enough, I'm always happy when someone is able to handle negativity in a mature way.
Good point. However, the Piraka defeating the Toa Nuva always struck me as a particularly awkward way to raise the stakes and show how powerful they are...
But the previous years made it perfectly clear that being a Toa isn't just about being the strongest warrior. The Toa Metru team was assembled out of a teacher, an archivist, a mask maker, a carver and a scholar, and yet, Nokama didn't mope around about how her job as a teacher didn't prepare her for a role of a Toa nor did she complain that her Mask of Translation is pretty useless in battle - heck, even Matau, the guy who saw being a Toa in the most superficial way possible, was impressed by Nokama's Great Rau's power and aknowledged it usefulness. Well, Vakama was the one to have the self-confidence issues, but as much as I dislike his angst in LoMN, a part of me appreciates it as a way to tell a message that was new and important to Bionicle at that point (the only Toa we had seen before 2004 were the Toa Mata/Nuva, who, despite having their innate character flaws, were treated as rather powerful and semi-mythical). Matoro's story arc struck me as a repeat of that... With unfortunate implications as an added bonus.
To be perfectly honest, I don't remember that, but if the being in question was a Bohrok Kal, it would be pretty childish and irrational of Matoro to blame himself over being beaten by something he simply couldn't have defeated. Again, reminds me of Vakama claiming 'I should've done something' after Lhikan was taken by the Dark Hunter... Yeah, I never really liked that particular trope.
Again, a good point. However, I can't help feeling that Matoro's sacrifice, combined with his characterization up to that point, instead of refuting the notion that he was useless, confirms it instead, by proving him right that he was useful only as a vessel for Ignika.
I'm sure there's a way to make them distinct enough from each other and even though they migth've turned out a bit similar, I'd still take it over having another archetypical funny Toa of Air.