Hi Richard, I went the same night as you and also enjoyed it.
I managed to miss ALL the support acts, though I wannted to see Rodrigo y Gabriela, I have one of thier albums which is rather good, Oh well maybe some other time.
Anyway back to the my experience of the new Wembley and Muse, first off I was impresed with the stadium itself, well thought out, easy to get into, nice wide concourse, lots of bars and toilets, etc. Lots of staff and not too dificult to leave either though I ended up being "guided" to Wembley Central Station by the helpful "stewards" even though I wanted to go to Wembley Park Station!!
I also agree about the sound which seemed a bit dull early in the set, in fact I didn't think it improved until they got to Invincible. Some way into their set.
I also noticed some microphone problems for Matt Bellamy especially when he moved from the left of the stage over to the right hand side.
The people floating around in the ballons during Unintended was a surprise.
This was the setlist btw.
1- Knights of Cydonia
2- Hysteria
3- Supermassive Black Hole
4- Map Of The Problematique
5- City Of Delusion
6- Butterflies and Hurricanes
7- Citizen Erased
8- Hoodoo
9- Feeling Good
10- Sunburn
11- Invincible
12- Starlight
13- Man of Mystery
14- Time is Running out
15- New Born
16- Soldier’s Poem
17- Unintended
18- Blackout
19- Plug in Baby
20- Micro Cuts
21- Stockholm Syndrome
22- Take a Bow
Highlights for me was Invincible, Time is Running out, New Born, Plug in Baby, Stockholm Syndrome, Take a Bow.