College football decided its national champions during the 2010s without any major controversy compared to previous decades, thanks to the tail end of the Bowl Championship Series and the advent of the College Football Playoff.
(Well, except for 2011, when Oklahoma State was left out in the cold as Alabama and LSU met in a rematch. Or in 2016 and 2017, when two non-conference champions were included the national semifinals. This still pales in comparison to previous postseason controversies.)
And now the decade is complete, with LSU closing the door with a win against Clemson to become only the second team to finish 15-0 in more than a century.