Matter of fact, here's an example of what would've made that interaction more favorable to the masses-
Shepard-"My God, I've been wanting to see you for so long! Nobody would tell me where you were. Are you ok? Did the Collectors do anything to you?"
Ash-"I'm fine, just shook up. Damn Collector's sent out a bunch of little bugs that paralyzed everyone in the colony."
Shepard-"Seeker swarms."
Ash-"I was able to shake it off and get away before they got me, but they captured everyone I was with."
EDI-"Shepard, about a third of the colonists were captured by the Collectors. There would have been more, had we not touched down.*
Ash-"What the....alright, I want an explanation. I hear about you being alive, then I hear about you joining Cerberus, flying around the Terminus Systems-"
Garrus(if you brought him)-"Ash, its a long story."
Ash-"God, Garrus too? What the hell is going on Shepard!? Why didn't you contact me!?"
Shepard-"Ash, I was dead. Really. I died on the Normandy, but Cerberus found my body and brought me back 2 years later. They want me to investigate why humans are disappearing around the Terminus Systems. And now you know why."
Random Squadmate-"The Collectors."
Ash-"So I'm supposed to believe this? After all I've heard about what you've done, what you've been doing, who you're with? Why didn't you go to the Alliance? Why is Cerberus still around!?"
Shepard-"I did! I went to the Citadel, Anderson didn't tell me where you were! And Cerberus is the only group willing to do anything about this! The Citadel, the Alliance-they don't want to bother with colonies in the Terminus Systems, and you know the reason for that, too."
Ash-"Bull. You could've reached me, you could've said something, ANYTHING."
*Ash starts to cry*
Ash-"I'd of helped you."
Shepard-"Ash, please don't-"
Ash-"No. I'm done. I'm Alliance to the bone. I know I can trust them. But you....and Cerberus....you don't even know, maybe they're helping the Collectors!"
Random Squadmate-"Typical Alliance Attitude."(Alter this per squaddie, this line being Miranda's)
Shepard-"Come on Ash, I can use you on the team. It'll be just like old times."
Ash-"I might not like aliens, but Cerberus, they HATE them. I'll never work for a group like that. I can't believe YOU would. Goodbye....skipper."
*Ash leaves*
Shep-"Joker, come pick us up. I'm tired of this colony."