Hi DarkSSJ,
I have personally worked on 2 commercial games using Delphi.
I am credited with working on Siege of Avalon ( http://www.siege-of-avalon.com/ ) and more recently Hero X ( http://us.infogrames.com/games/herox_pc_action/ ), which was released earlier this year.

SOA was written with Delphi 4, while HeroX used Delphi 5 & 6. Both games used DirectDraw for rendering.

The only problem I see with writing games with Delphi is that the compiler is not available for consoles. That said, it is great for any PC ( Windows or Linux ) games.