Now, it was the best primarily because I really like her music and it means something to me because she helped me learn French.
But here are the other reasons: 1) they brought a TON of their own lighting equipment and it was fantastic. It was synced with the beat and was sometimes thematically (the lighting!) related to the songs. For example, their was a jungle themed light filter for Safari Disco Club.
2) Their theatricality made it a real performance—the drummers got into it, pointing with their drumsticks, they came around to shake their asses, changed costumes, and it was evident that they practiced some of the movements and, for Yelle, facial expressions that they were going to do. Now if you wanted big theatricality, you could go to Lady Gaga, but with Yelle, it didn't detract from the music. It just added that they cared and were very professional, and having fun. The first priority was dancing and keeping the energy up. They also knew to bring real drum sets and not stupid electronic drum pads like their opening act. In fact, there were two drum sets, which, might sound a bit weird at first, but it added to the energy, created symmetry on stage, and didn't detract at all from the sound balance.
3) The foreign language effect —the paradise rock club is not a big gig, but Yelle is an established star (if mid-level), so the fact that she came to this venue, and that we all go to be so close—it was a great concert experience. I haven't been to that many concerts, but to hear everyone just YELL after each song finished. We were into it. C'était complètement fou.
4) Unsurprisingly, she stayed around afterwards and signed autographs and took pictures. I hear she likes hugs, too.
5) the French style – I think Julie is sexy, but she didn't come out in or ever strip down to her skinnies. But more overall, it was something to behold an effortless style that didn't try too hard for appeal.