OK, since you clicked I'm assuming you've seen all of season 3. If not, don't read on...
What a brilliant show. Top 5 all-time imo.
I need to re-watch the whole season to pick out some details but...
Obviously the main thrust of this season was Frank and Claire's relationship. We'd seen some cracks build in previous seasons, but neither of them seem to mind the other fuging around (no real shock there) as long as it furthered their defined goals.
Claire seemed to lose sight of that tho and started wanting more for herself, and of course Frank, being the controlling, ruthless asshole he is, gives her as much as he can, but keeps as much real power for himself as he can.
Both Spacey and Wright deserve awards for their acting, Spacey in particular.
Doug: I knew he wasn't going to let Rachel live... he seemed to be really considering it, but in the end I knew he had to do it and would.
Dunbar: She started with noble intentions and is falling down the path of power, pretty funny to see her make the play with the journal and have Frank call her on it. Then when Frank got the phone from Doug and told her to fug off, god that was great.
Interesting that they just cut Mendoza out so abrubtly... I guess they had to given the Dunbar storyline.
I found Petrov's character to be interesting in that he's just like Frank and I think Frank hated that. Petrov seemed to best Frank at every turn... I suspect we'll see Frank turn the tables on him next season somehow.
Two characters that are really creepy to me are Meechum and Tom (the author) both of them are really weird to me.
One thing I love about the show as a middle aged guy is all the hot 40 something women they have on the show. That's a real plus.