Cullen is not superior to Samson in any way. They've both been shaped by circumstances. If Cullen were truly so superior, here's how his career would have evolved:
- He'd never have nurtured his infatuation for a mage.
- He'd never have insisted on killing all mages in the Harrowing Chamber.
- He'd never have stood by Meredith throughout Act 3, only rebelling in the last moment.
- He'd have waited until Corypheus' defeat to stop talking lyrium (YES, he would, because withdrawal makes you psychologically and physically fragile, and therefore, incapable of thinking straight, of even standing, imagine having to lead troops in war.)
I don't think anyone said that Cullen was superior in any way to Samson, merely that both men are two sides of the same coin, only one was given a chance the other didn't and thus zigged where the other zagged? Even Cullen thinks that if things had been different, he could have ended up like Samson, so accusing us of putting the guy on a pedestal when even he doesn't, really disservices the character?
And to be fair, none of your points really hold up to scrutiny;
Cullen's childish crush was simply that, a crush, one that he never acted on. He wasn't nailing her in the cloakrooms, nor abusing his authority to force her to do anything against her will (like some other Templars). Indeed, if you try to seduce him, he runs away in terror... and doesn't that reek a tad of a double-standard here, since no-one is bashing the female mage for attempting to break the rules to get some?
Imagine if you've been suffering for an unknown length of time at the hands of blood mages, demons and might have been without lyrium for long enough that you're in the initial stages of withdrawal? Would you be in the most psychologically stable position to offer any kind of sound judgement?
By Act 3, Meredith had clamped down and consolidated her power with both the Templars and over Kirkwall, so there was very little that Cullen could actually do to challenge her even if he tried? You do remember what happened when Thrask's coalition of Mages and Templars tried to overthrow her, they ended up being hung in front of the Gallows as a warning? Furthermore, for the most part her actions during Act 3 were paranoid and draconian (but what's new), but not yet as obviously unstable that you'd question her lead on things? It's only when she went completely doolally in front of everyone and threaten her own officers, that he decided to relieve her of command.
As for his Lyrium addiction and withdrawal, he's long since appeared to have gotten over the hump when it comes to going cold-turkey where you have a physiological need for the drug in your system and now merely is battling the psychological need instead? Plus he does act responsibly, having Cassandra as his sponsor and contingency to relieve him of command if he ever fails in his duties? It's not like he did this without telling anyone of what he was doing and didn't have the knowledge and support of his co-workers? He only tells the Inquisitor when s/he becomes his direct superior, whereas before, they were technically just an Agent and not in the "official" chain of command.
"Oh, you're not distracting. I mean, you are, but, well, you're not. I mean, you can talk to me anytime you like."
-Cullen in DA:O when talking to Amell right at the beginning of the game. It's one of the lines he answers to one of the dialog options available.
Unless you've never been wooed before, you'd not miss this obvious attempt at flirting. If I were Meredith and word got to me of such behaviour from one of my men, he'd be expelled from the Order in the same day. Or worse.
How is that seduction, that's mostly just bumbling flirting?
Given the amount of abuse and even possible rape going on in the Gallows, I doubt Meredith would have expelled someone for what can barely be called flirting. She'd have probably given the Templar a stern warning and punished the mage instead to remove their "corrupting" influence?
As for Greagoir, he'd have probably given him a light warning about not fraternising, but there's no actual rule about talking to the mages (even if most Templars don't), which is all Cullen was actually suggesting with that line?