I've watched the entire run so far and after a good beginning, what has happened to it? By S4 mid-point, its turned into the most dreadful, ham-acted, soap opera where the artifact mysteries are largely overwhelmed by the childish acting - especially Pete who appears to have gone from being slightly immature macho man to an emotional 7yrs old. He reminds me a lot of Seeley Booth in Bones on a bad acting day.
Even Myky is suffering from the same affliction - she was the sensible one and now is hyper/silly girl which doesn't sit well. These two are meant to be top notch Secret Service agents in their late 20s for heaven's sake, not Buffy extras.
I can only assume the writing team has changed, or the producers are aiming at a younger/less demanding demographic. Whatever is going on - I certainly won't be tuning in to see the rest of S4 if it carries on like this.
What a pity.