Needs to be condemned
Don't be fooled, this is a Sheraton in name only.
Simply put, do not stay here. My basic requirements for a hotel of clean, quiet, and comfortable went 0 for 3. 
As a Platinum I was "upgraded" to a larger room on the 7th floor. The larger room simply provided more surface area for the lack of cleaning and maintenance. After the room next door started throwing a party (not the hotel's fault) I threw in the towel and went down to the front desk and was moved to a 5th floor room facing the 8. Exact same condition as the first room (and loud), with added bonus of spackle where they've fixed the numerous holes in the wall. 
Dirty and stained carpets (I wore shoes walking around the room and slept in socks), furniture that wouldn't have been out of place in a dorm room that I wouldn't have sat on in a Tyvek suit, and a disgusting bathroom with shower pressure that can generously be described as "San Fransisco mist." I ended-up rinsing the shampoo out of my hair in the sink.
The door to the bathroom doesn't even open because the toilet is in the way. 
Free parking and internet for being a Platinum as well as Club room access. Unfortunately when they moved my room they didn't recode my key for club access and each trip on the elevator involves about 15 minutes (each direction) because of there only being one elevator in service. When I finally got into the Club lounge I found it to be overcrowded and picked-over so I threw in the towel and ate breakfast in the restaurant. Eggs were cold, but at least I didn't have to fight 50 other people. In the evenings you get to have conversations with the prostitutes hanging in the lobby as you wait, and wait, and wait for the elevator. 
Gym is a disgrace. I've seen nicer gyms at Hamptons.
When I mentioned the fact that the hotel should be condemned at check-out the Front desk cleark said "oh, we know. But we're getting new carpets next year." 
Without exaggeration I've stayed in non-affiliation hotels in third-world countries that were cleaner then the Sheraton Mission Valley. It's more Rodeway Inn then Sheraton.