I know people like to mention the games they released 2 or even 3 gens ago but last gen was truly something else.
Half life 2: episode 1 (2006)
Half life 2: episode 2 (2007)
Portal (2007)
Team fortress 2 (2007)
Left 4 Dead (2008)
Left 4 Dead 2 (2009)
Portal 2 (2011)
All these groundbreaking (ep.1 less so) released in the span of 5 years. There's probably a lot more but I only played there console games and these were what released between the 360/ps3. I know the valve of today is basically a different company in how they operate but shit, last gen was bliss.
Half life 2: episode 1 (2006)
Half life 2: episode 2 (2007)
Portal (2007)
Team fortress 2 (2007)
Left 4 Dead (2008)
Left 4 Dead 2 (2009)
Portal 2 (2011)
All these groundbreaking (ep.1 less so) released in the span of 5 years. There's probably a lot more but I only played there console games and these were what released between the 360/ps3. I know the valve of today is basically a different company in how they operate but shit, last gen was bliss.