Id agree with that, as much as I enjoyed House of Cards season 1, Orange was the better show in pretty much every way
House of Cards would have probably been better off as a 8 or 10 episode miniseries
The thing with these anti-hero shows, and one that is probably much more influenced by Richard III than say, The Shield or Breaking Bad, is the inevitable karmic retribution that the character faces. Hell, it's built right into the name of the show - we're all waiting to see when the "House of Cards" will fall in on itself. But after Breaking Bad, I realized that there's really only so much they can do with an arc like that and make it satisfying.
Perhaps what makes this more interesting, and perhaps more Shakespearean, is the fact that Underwood is a character that drips charisma. The fact that he's allowed to break the fourth wall and directly "charm" the audience only helps you get on his side, because he's letting you in on how much smarter he is than the other people in the room - and by association, through dramatic irony, you are also smarter than all of them as well. You're in on the crime, complicit in everything that Underwood chooses to do throughout the 26 episodes.
The problem is that a character like that can only win, because the only time he truly loses is going to be when the series finally concludes. Which is fine, as Breaking Bad and The Shield and maybe even The Wire has shown. The problem is that I don't think Frank as interesting as any of those other characters, and the cast that surrounds him are equally two-dimensional.
Perhaps fitting in the entire story into a single season would feel a bit unrealistic, and while I think the final arc of season 2 is much stronger than its opening 6 episodes, I think by the time more people get around to watching the whole thing, they'll feel that there's a lot of fat that really didn't need to be there.