Read my post again...
It's more of a comparison with Homeland Season 1 and 2. I don't recall anybody saying Breaking Bad >>> Homeland due to realism.
It never was about that. It was more of people loving Season 1 for how it was done, and then just noticing the change in Season 2 and talking about it.
And what was really all that unrealistic this season? The shootout at the tailor shop? The helicopter scooping up Brody? Nazir being in the country? The bombing at the end? I'm pretty sure those are the standard arguments I've heard. Oh wait, also Carrie being allowed back to the CIA, which seems like a stupid argument now. Now take all those "unrealistic" events and compare them to a dude wearing a suicide vest amongst the most powerful members of the U.S gov't and being a dislodged wire away from blowing up like C4, no Chris Tucker. Not to mention there was already a suicide bombing before last season's finale. Or let's look at a supposedly deceased Tom Walker getting back in the states, kidnapping a golden girl and sniping nikkas. So two Marines were not only broken but converted to terrorists? I can do this all day. Realism is one of the biggest copouts when dudes want to criticize a show.
Season 1 was season 1. Most first seasons are liked more than second seasons for the very fact that second seasons are always compared to first seasons instead of being judged on their own merits. The dynamic between Carrie and Brody was what made season 1 so great, as well as their performances. The uncertainty about Brody's allegiance and the viewer rooting for and against him is what made season 1 great. Those things couldn't be replicated this season. For that to happen, Carrie would have to be back at the CIA and Brody being a terrorist would have to remain undiscovered. But how does she end up back at the CIA? And she's under the impression she was wrong about him all along so how do they even end up being around each other? You cats complained incessantly about her being back in the CIA, but this season would consist of her teaching ESL classes and watching Brody at budget meetings otherwise. Season 1 was unique because that dynamic was unique and impossible to recreate. Instead it evolved into something compelling in its own right that payed off in the finale.