if you've played the game there's quite a few references about the huntresses lol. There's one reference to where a Krogan unit couldn't handle a Commando unit, then there's also Aria (not a squad but a member of one from her past) who has been mention as Wrex's toughest opponent in his life and Aria has stories where she wrecked havoc on Omega. Then there's also the lone Asari on the citadel who is mental but was a Commando who murdered half her converted squad and did hat she had to in order to survive including killing a innocent injured girl that would've given her position away. Honestly I think your reference to the commando is pretty weak lol. I never said "ALL" of them were feared, they are feared in general which you don't see. Next is the matter of Thessia. None of the home worlds would stand a chance vs the reapers anyways. were they losing when Shepard arrived? Sure but so is everyone else. the Turians were slowly losing ground on the moon near Palavan when you arrived, it's even in some of the messages if you read them. The Batarians were just obliterated in the first wave of the Reapers when the game started and the Vorcha were isolated from help for the most part and the Volus replied upon Turian help which was very limited. There's all kind of elite squads who were struggling in the game. The N7 program was shutdown in the war and the Turian had their Cabals (their own special elite unit that had biotics) were stretched thin and were their just to try and help them from losing ground. So yea, we can mention the Asari Commandos in the game that died easily if that's how you view them. A thing to note is Shepard vs Benezia's commando's is Shepard is the best soldier in the galaxy as many would say. And for the Asari that died at the Asari temple well, you don't know if the Asari put up a fight or not to begin with, I believe you just assume they rolled over and died. We don't know if they gave the Reapers hell that were in their to begin with or if they just got overwhelmed from the start. If you notice they got the bomb to its target, the only thing they failed was blowing it up, they got the charges set and everything. I view it as they wanted to get out alive instead and tried to fight their way out instead of blowing the place up with the last Commando standing. If you're still not convinced that commando's are a threat I can probably look up a few more that are mentioned, these are just the one's I remember. So for now i'll end it with yes, some Commando units were weak, but some are well known. The one defending Thessia happened to have been by itself for days is the one you run into first thing when you land on Thessia, just to let you know
one squad, fighting overwhelming enemy forces for days.