I think people are being a bit harsh. The whole asethetic seems to be a homage to synth pop and the 70s/80s. I don't think it cold and calculated for radio/commercial success, it's not exactly like they are some unknown indie band.
Lyrically they seem to be covering the same themes as always really.. the frustrating thing is that everyone has been doing this since that last Daft Punk album so it feels kinda pointless.
Arcade Fires skills have never been focused on catchy hooks and tight song writing. They are better when they are sprawling and emotionally intense. It seems like a bad turn imo.