Granted, Glendale's downtown is definitely not in the same class as Scottsdale, Tempe or Gilbert, but it has a lot of potential to gain a distinct vibe which would attract people. But, it would take some effort from the city to act as the catalyst to start that change. Instead, the city seems entirely focused on developing the shiny, chain-based glitz which is Westgate.
I'm not opposed to Westgate...it definitely can become a large economic driver for the west side and the stadiums are ready-made seeds for growth in the area. But, to me it feels like Glendale is trying to create a "destination" by building lots of stuff and throwing in some chain restaurants. This will undoubtedly generate a lot of revenue from sports fans, but it doesn't seem connected to the Valley or even to Arizona in any way. Westgate and the stadiums could be picked up and set down just about anywhere in the country and they wouldn't feel out of place.
On the other hand, downtown Glendale has some historical connection to the city and it has some character. It doesn't yet have the vibe that other Valley spots have developed, but I really think that with some nurturing by the city, it could.