I wouldn't say that. The Architect has good intentions but his methods favour Darkspawn more than any other race. Hence I would not trust him
Well, it's really up to the player's interpretations.
Personally, I never had a problem with him - sure, he started the last blight; however it was through his attempts to cure his brethren of the archdemon's thrall. From what I recall, he attempted to free the archdemon of the taint, thinking that it would free the Darkspawn, and it just backfired. Really badly.
Even if I did hold it against him, the fact that he has moved away from waking up archdemons, and on to using Warden blood to cure the Darkspawn one at a time show's that he's at least learning from his mistakes. The amount of blood needed for the ritual isn't a lethal amount (if it was, the Warden and their companions would've died when he captured them) And his discussion with the Warden at the end of the DLC suggests he's willing to find a mutually beneficial route to achieving his ends.
Not to mention his goals and ours line up rather well - he wants to free his people from the call of the tainted gods, and give them free will; which would put an end to the blights. Personally, I don't really want to kill the Darkspawn - we just have to at the moment, because they're being forced to wage war with the rest of Thedas by the archdemons. If they're sentient, and are wiling to be allies (and the Messenger proves that some Darkspawn are) I don't see a need to kill them.
Also, to bring this back on topic, any information he gathers in regards to freeing the Darkspawn of the archdemon's thrall could likely be used to cure the Warden of the taint. So even if the Urn can't heal that, I don't see why any information the Architect discovers couldn't be used to lift the curse. And I don't see any reason *not* to trust him - especially if what I was quoting actually happened in the books.
All the choices in DA have been shades of Grey. I don't think the Architect choice is going to turn out all good or all bad either way. I do think, though, that curing the taint could be a possibility with saving him. It may come at a price, but everything in DA does.
That's just my opinion though. lol