Yeah, IDW MLP was largely slice of life stuff, with the occasional multi-parter event...which usually ended up getting contradicted by the actual cartoon a few seasons later. There's a reason "The Comics aren't canon" became a meme within this fandom. I can't really blame anyone for not sticking around for the okay issues when nothing can REALLY happen in the comic.
And, I kind of sympathize with IDW on MLP. You're trying to write a slice of life comic where you're NOT REALLY allowed to develop or change the characters, because they have to match the cartoon. And you can't really create too many of your own characters, so you can develop THEM, because this is a toy advertisement first and foremost, and Hasbro wants THEIR toys front and center. So, you just end up putting the characters in a bunch of goofy situations in order to give the static characters something to do. Like bringing apples to life in a Attack of the Killer Tomatoes parody. Or having Rarity pet-sit Cerberus while Tartarus gets repaired. It is OFTEN cute, but not often substantial.
That...might be changing with G5. I feel like Hasbro kind of assigned different aspects of this cartoon to different mediums, so each part has something unique to do. The Movies are possibly for the big, franchise changing events, and the eventual new toy gimmicks. The Youtube shorts are all about comedy and slice of life stuff. The CGI cartoon is probably going to be where you go for adventures and action. And, it seems like IDW is getting to do some background lore and connections to G4. It's not a bad split (on paper), and it incentivizes fans to keep track of EVERYTHING. I worry about no one part feeling complete in this theoretical system, but right now this is all just me speculating, so maybe I'm completely off about Hasbro's actual plans.
And, to be fair, I think almost ALL of IDW's other comics are probably better handled, just because the comic industry knows how to run action books. I feel like 90% of the western comic market is action comics in one way or another. If you're not sure what to do, you can just copy something else that's worked before. But, MLP is a different beast entirely. The artists trying to break into comics didn't grow up drawing ponies, they doodled superheroes. The writers who want into comics have probably read hundreds of Spider-Man or Batman comics, but how many slice of life comics have they read outside of maybe Calvin and Hobbs or Peanuts? There are very few people already working in the industry who were ready for MLP's popularity, and they get compared to enthusiastic fan-artists that don't have to worry about deadlines. There's a learning curve here that no one was really prepared for, and I think that's why the comics can be so hit or miss. Most of these creators have never written or drawn anything quite like this.
And, yeah, the lack of content per issue is a problem when comics are nearly universally $4 a pop for maybe 10 minutes of entertainment (a generous estimate, I'll admit). And I feel like the industry is ever so slowly inching towards $5 a issue, with specials and one shots that are $6 or $8 getting us used to the inevitable change. Marvel's brief affair with bringing $1 reprints back was a highlight for me, and I miss that True Believers program. It would take something drastic to lower the price of these books, and I have no idea what. Even a avalanche of new readers probably wouldn't do it.
Personally, I'm definitely going to try and stick with the G5 comic for this first year. The solicitations have me curious enough for that, at least. We'll see how this generation fairs once everything's out and all the gears start meshing with each other. I kind of want to see how this machine of a franchise will run.