I know that feeling, I started reading them about a year ago and finished the last one a few weeks ago, started so I finished the series attitude. I did find them a bit heavy on the, ahem, 'romance' and I don't think that will ever go away.
They do pick up a bit with the US Marshall side but they are a bit of a slog to get through. Don't bother buying Flirt, just go to the library/bookshop and spend a couple of hours reading it there (it's tiny at under 200 pages and so bad that this is the best part of it).