a) the Quazal server frequently crashed. Near the end we were having hours long outages often without warning. It was pretty terrible. At the start it was great, but by the end before the transition it wasn't because their focus was shifting to supporting their own projects and away from vCoH.
b) they were bought by Ubisoft who had no desire to host SEGA (or anyone's) games on their servers. So Relic are as likely to go with them again as they are of having EA host a game on their servers.
Say what you will about the Steamworks performance, but Relic/SEGA invested a lot of time, effort and money to keep vCoH online at a time when most studios/publishers would have closed the game.
Truth. World in conflict for instance. That game has no online multilayer anymore. Just played coh 1 and world of conflict at a small lan. I'm so glad I can still play coh1 outside of it. Been enjoying myself all week in automatch.