mechmouse: Come on, unless things have dramatically changed, Steam is pitifully understaffed for its customer base. Every other company of similar customer base can deal with support issues faster and more reliably than Steam
They did make changes over the years, mostly to reduce the amount of tickets coming in. For instance they removed the Steam Inventory Gift system heavily reducing scams/fraud/resales. Requiring mobile authenticator for trades also dramatically reduced the amount of hijacks which was up to ~77k hijacks a month.
For transparency they also have a Steam Support stats page where you can see for yourself what the rough response times are over recent time.
http://store.steampowered.com/stats/support (last 24 hours, type/nr of requests/avg time for response)
Refund Requests 95,188 52.20 minutes to 2.90 hours
Account Security & Recovery 23,857 9.83 hours to 2.35 days
Game & Steam Technical Support 2,607 3.53 hours to 1.25 days
Purchase & Billing Support 2,272 2.42 hours to 16.72 hours