Would you find it harder to love him if he "lied" more obviously, like by denying to be an ancient elf? His situation and reasons would be the same after all. Would it make so much of a difference if only he spoke out the lie instead of just hiding the truth?
For example, I never had an actual issue with Blackwall's explicit lies. Because it makes sense that he lied. He wanted to help, he wanted to fight the greater evil, but he knew the Inquisition would not take him in if he told the truth. Hence he lied to me. I find that a natural reaction and I understand his reasons, so I accept this. I have a problem with what he did (ordering killings for money), but the lying itself is not my big issue.
Same with Solas. I question his plan in the first place, giving away the orb and stuff. And I am angry at him for keeping knowledge away that could have saved lives (e.g., leading us to Skyhold before an assault on Haven). But him "lying" about who he was? I understand that, I have no problem with that.
I think likewise. (I have finally run out of likes for the day, as vengeance for the near rebellion with the emoticons.
)
What's funny is that the only reason I'd have to be angry with Blackwall about lying is the potential devastation that could be caused by relying on him to slay the Archdemon, or sense darkspawn, or bribe the Architect with his blood to get a movie date. But Blackwall doesn't know about any of that. 
It's hard to blame Solas for Haven and Skyhold because he didn't seem to know that Corypheus had an army. At that point, I don't think he even knew Corypheus had survived, did he? He probably doesn't feel like handing out awesome climate defying fortresses to every quasi-military-heretical organization he runs into, after all. (Still would have been nice to, y'know, have a defensible position. Adan died for your sins, Fen'harel.
) But hey, the mountain slopes and trebuchets became as much of a force multiplier as the walls would have been. 
I always wished we could have left Skyhold and explored the surrounding area, particularly the village that Blackwall's carving statues for. Military followers, the bulk of the Inquisition's army, and a lovely looking environment.
Back on topic, the main difference between Solas lying bald-headedly and lying carefully with only the occasional direct falsehood is:
Blatant Lies, post-epilogue: You lying bastard!
Omission Lies, post-epilogue: You clever lying bastard!
One takes more skill and consideration. 



What is the exact limit on emoticons, anyhow? 