In the past few years, there were some memorable events where large or AAA companies that released games with glaring bugs or glitches. Rome 2, Assassins Creed: Unity, and so on had issues immediately after launch that people are starting to shy away from buying games on release. I have never bought a game on release, even if I was tempted.
Do you but games on release or not? Can you give examples of game breaking bugs on various games? Are developers relying on patches? So many questions. I guess it comes with the fact that games are getting more complex now.
Blizzard is the only company I buy games from on release day. I can´t think of another company that doesn´t usually have glaring issues the first few weeks. Blizzard is not perfect by any means, but at least I know the game will be playable and fun until the minor stuff gets fixed.