I'm not sure if it was intended or not, for whatever that's worth. Thessia was supposed to be a big loss with Shepard suffering a personal defeat. The fact that it was the Asari homeworld meant that Liara and the rest of the bunch would get more focus on their sad time, talks about loss, apology scenes, etc.
Everyone suffers personal defeats, but not everyone handles them by moping and blaming themselves. *Cue the Cave Johnson lemons speech* Shepard loses Earth and is driven to fix the problem. When A/K is in the hospital, Shepard can be soft or hard.
I'm pretty sure they intended for Thessia to be more important than Earth or Palaven, simply because it was the asari. The asari (and to a lesser extent, the krogan) always had favored status, and things were supposed to be bad simply because they happened to them.
I think the real question is: "Were the asari always created to be the creator's pet, everyone must love them race, and Liara was given a face for it" or "Liara was meant to be the creator's pet, and the other asari were built on her template?"
Either way, the game really needed a moment where you could say "I'm not moping around, Councilor. You waited until the last minute, buried your heads in the sand, and thought yourself above galactic annihilation of the 'lesser' species, and, only when it was too late, you decided to beg for help. High Command's arrogance nearly cost us this war, and innocent asari are the ones paying the price." And then, while I wait to go to Sanctuary, I can talk with Kaidan and Adams, Garrus, Javik, or whoever and not be all pissy.