While Modestep was an amazing live act, the evening was far too long and the opening DJs actually got progressively worse as the evening continued. Modestep didn't come on stage until 11:30, and finally left around 12:30. I've never been to a show that's kept me later than about 11:30.
Not to say it was bad, but it just was not anticipated.
The first DJ was actually really solid, mixed very well. By the time the third DJ started (the final one before Modestep), my friend and I were sick of it. And opening up with a version of Hendrix's Star Spangled Banner... that was being scratched and "remixed" (out of time, I might add) was horribly disappointing and borderline offensive.
That being said, Modestep was outrageously solid (though the guitarist was a bit messy with his playing). It was totally worth the wait.