One of the first things I noticed last night whilst watching the Gabba Test was the odd colouring of the seats. It’s something I remember from previous Ashes; they’re designed so as to give the impression of a full house even when there isn’t one. (One can infer then that there wasn’t a full house and that the seats don’t do a particularly good job of disguising that fact.) I think it’s pretty stupid, but it’s part of a much broader dislike of most Australian grounds.
Many Australian grounds are not owned by their clubs, but by the state government, and are used for multiple sports, most notably Australian rules football (AFL). As anyone who has tried to watch baseball in a multi-purpose stadium knows, this all but ruins the ground. The Gabba and the MCG are the worst. They’re just great monotone concrete bowls. There is no variation, no individuality, no character. Neither of them have individual stands anymore, they are just unbroken rings of seating. The pavilions in both grounds are little more than greenhouses set into the massive stands and the players emerge from tunnels. 
The rot is spreading too. The Adelaide Oval is being renovated to increase capacity for the AFL and there are plans for the SCG to become more like the MCG. (Though that is at least for partly cricketing reasons, specifically the World Cup.) The WACA is the only ground that is not often used for AFL and it’s also the only ground with a sensible renovation plan.
I should point out that English grounds are not perfect. The Point at Old Trafford is a monstrosity which at the very least ought to have been placed opposite the pavilion instead of literally overshadowing it. And the Edgbaston renovations aren’t brilliant either. They are both an attempt to improve the grounds suitability for cricket though, which is their actual function. They aren’t built for football at the cost of cricket.