Pikachu's the spoiled rich kid who broke into a party despite never being invited. Change my mind.
In all seriousness, though, after watching the trailer and seeing some of the new info that's come out of this set, I am CAUTIOUSLY optimistic that the rest of the set will be good. I'm not gonna make the same mistake I did when Extradimensional Crisis's trailer dropped and I instantly said the set was bad; I have faith they are saving up some great cards for when the set actually drops.
However, with that in mind, I personally feel like what they DID show in the trailer was....kinda weak. Don't get me wrong, Dual Types are pretty cool, and I am ESPECIALLY hyped for ZA megas coming to the game, but honestly, from what I'm seeing, these cards aren't extraordinarily special in my personal opinion, and it's not really adding any HUGE spicy new mechanics that'll wildly change up the entire game.
My first gripe with the set so far (and probably the one that'll get me spam downvoted), is that it's yet again featuring a lot of Kanto shoehorned in. I mean if you SERIOUSLY look at most of the EX cards revealed thus far, quite a few of them are Gen 1 mons or Gen 1 mega forms. Let's not even mention the new Kanto starter full arts. I think it's still just a personal thing with me not liking when Kanto Pokémon are the main "focus" AGAIN in a new set, but after Mega Shine, I am really not looking forward to seeing Cheeto Dragon & friends show their faces again. And of course, we're getting ANOTHER pikachu ex for some reason.
My second and last sort of issue I'm seeing with this set from what we got so far is that it feels like the EX mons are starting to get a bit "cookie-cutter-esque" in my opinion. Mega Greninja and Mew ex seem to be the worst offenders on this list, with Mega Greninja basically just being a slightly better Kingdra ex and Mew ex serving as a Psychic Moltres ex. For these cards being the first show of what the new set will have to offer, seeing so many recycled mechanics doesn't really hype me up a whole lot. That's not to say there's NOTHING new of course, don't get me wrong. Mega Mewtwo X ex and the new Ribombee seem like they are bringing new stuff to the table. But overall, first impressions are unfortunately pretty weak.
All of this is to say, I don't think this set is going to be BAD. It is indeed a new base set, and the number of new cards we're probably going to get will almost certainly spice things up a bit at least in some form. The new arts for all of the EX pokemon and 1 stars we haven't seen yet are also probably going to look BEAUTIFUL as always, so I'm always looking forward to that as well.
Again, point isn't to flame on the set, I'm just expressing a bit of caution as the full set actually gets released. But this is just my opinion which probably doesn't matter, so I wanna hear what yall have to say.