To briefly go back to a previous topic, if someone wants to spend a week of their life sitting in front of a theater, okay, sure, more power to them. Not gonna stop me from thinking, "Good grief, life is too precious to waste doing nothing in front of a theater! Go home and do something, y'know, useful!"
On the topic of songs: I haven't heard all of them, but by and large I find myself not wanting to listen. "Giggle at the Ghosties" may be infectious, but it's a bad, annoying sort of infectious. The CMC performance and You Gotta Share may have been intended to be bad, but that doesn't make up for them being bad; having characters in the show snark about how awful that was simply doesn't win me over.
Pinkie's Invitation has a decent melody, but the lyrics! Just like almost every other song in the show, the lyrics are reminiscent of something a high school senior wrote during the poetry unit in English class just to get their instructors off their back. The words and rhymes don't flow very well.
Art of the Dress is probably the best of the ones I've heard since Tabitha is a great singer and is overall very fun, but is docked points for ripping almost wholesale from
other sources and including such asinine lyrics as, "I'm stitching Twilight's dress!" Um, okay?
Oddly, I find both of Pinky's songs in The Ticketmaster to be okay. Nothing good, nothing bad.