I knew about this show, but dismissed it because I don't like Spacey. However, a friend at work gave it two thumbs up so I checked it out. I was instantly hooked on the gritty plotlines, the excellent acting and believable dialogue. I don't know much about DC politics, but these storylines feel plausible and that's enough for me.
Spacey may be a jerk, but he plays his role effectively.
I highly recommend this show and I eagerly await Season 2.