People disappointed in the song choices should consider that the band performs the tracks that they enjoy, first and foremost, and arranges them in a sequence that works best for them. Although the audience is absolutely an important consideration, they'll never be able to please everyone. So for every cat like me who saw, for example, "Aces High" performed on the Powerslave tour and several times since, for someone else this will be their first time experiencing this mythical legendary song. Not that that makes it more palatable for me.
That said, I can't make sense of some of their choices but it is what it is. And even if they chose to change things up for the US leg as they did with incorporating Senjutsu tracks into the LOTB tour, they may delete something I really like. I saw the original LOTB, which for my money was their greatest setlist of all time, but sold my ticket for the second leg because I thought they ruined it with the three new tracks (Senjutsu, Stratego and Writing On The Wall).
Let me say this about the weirdos knocking Simon's selection and performance. That is a TOUGH gig to accept, taking the chair following a bonafide beloved legend, and with one of the biggest bands in the world with your first performance with them before a sold-out arena. And playing material that a) isn't easy, b) playing with guys who've played together literally for decades, and c) performing songs that rabid fans know every nuance of. That guy deserves a ton of credit and appreciation. The drum throne is the one piece I thought Steve would consider irreplaceable. He is the engine of the band but Simon's the New Guy. That's a scrotum of steel right there.
Here's what a lot of fans are missing. I'm aging myself but I was there; Nicko experienced the same thing when he replaced Clive, there just wasn't any social media for everyone to vent and opine on. There are fans to this day who will say that Clive Burr was the band's best drummer and Nicko changed Maiden's vibe for the worst. Back when "POM" dropped, believe it or not a lot of fans complained and were unhappy. So as with most of life, this reaction is nothing new.
It's cool to have an opinion but let it be an informed one. If you don't dig Simon as a musician, that's cool. If you say he's not good enough to be in Maiden, he sucks, etc...you're a moron. IMHO.
I'm sure that the band would consider this first gig rubbish and I want to hear them in a couple of weeks after they've gotten more comfortable and locked in.