Some people like some things in a game and others - other things. And it's a matter of timing, in many cases. I, for instance, tried to play Planscape: Torment several years ago. Couldn't. I chose instead to read the 'novelized game'. Bad writing. Stopped that, too. Perhaps I'll try again. I'm sure this was a great game at THAT time, because so many people say it's a masterpiece. However, if somebody published it today for the first time, I wonder how many good reviews would receive and how many people would play it and find it interesting. Me... count me out already, been there, seen it. Other top games/ series (according to those who liked them) I couldn't play: Half Life, Call of Duty: Modern Warfare, Dragon Age, FIFA, Warcraft, Need for Speed, Gothic, Dead Space, Sins of a Solar Empire etc. etc. etc...
On the other hand, I loved Mass Effect 2 (part of one of my favourite series, along with other series: Max Payne, Mechwarrior, The King's Bounty, The Witcher, Age of Empires, The Longest Journey, Jagged Alliance, Heroes of Might and Magic, Operation Flashpoint/ArmA, Fallout, STALKER and so on). And this was BioWare, and not '90s. And so many people liked those series and defend them fiercely when somebody say they are garbage. However, if I played AoE 1 or Master of Orion 1 today for the first time, I'd probably find them not that great. Or the Mass Effect series in 10 years from now, when the whole immersive cinematic experience would be dated and everyone will have holodecks in basement and the PC/PS/XBox/whatever games won't be remembered anymore.
So, in my opinion: 1. it's timing and personal preferences and 2. whoever worked hard and brought such great games on shelves deserves to be remembered (and this is the case with both CD and Bio).