I'd like to mention something here...Ronaldo was not that decisive player for Real Madrid in the big ties before 2017 CL as I can read that people state that as if it is fact although I think we were watching the same matches.
- 2010: Lost to Lyon at the round of 16
- 2011: Lost to Barcelona and went missing while Messi decided the tie by scoring twice at the Bernabeu
- 2012: Scored twice vs Bayern "one from a penalty", but MISSED in the penalty shootouts as he did in 2008 vs Chelsea as well and they lost
- 2013: Scored a tap-in to lose 4-1 vs Dortmund and in the return leg, he disappeared. Madrid also went trophyless losing the league by December to a literally managerless Barcelona, lost the final of the Copa del Rey at home vs Atletico in which Ronaldo was sent off. But he won the Ballon D'or for scoring a hat-trick vs Sweden to send Portugal to the World Cup after extending the voting till November!!
- 2014: In the semi-finals, Madrid won 1-0 through a Benzema goal in the 1st leg and then Ramos scored TWICE to make it 3-0 on aggregate to Madrid by half-time and Bayern were required to score 5 goals in 45 mins to qualify...Then, Ronaldo added 2 indecisive goals "clear as day". Then, we all know who scored the last minute equaliser vs Atletico to take the final to extra time, we know who scored the 2nd and 3rd goals and we also know who scored the penalty at the 120th minute to make it 4-1 and won the ballon d'or for being that decisive as a result
- 2015: Scored a tap-in at Juventus stadium and a penalty at the Bernabeu, but Real Madrid lost in the Semi-finals.
- 2016: In both games vs Man City at one of their worst periods in recent memory, he disappeared and they won 1-0 on aggregate via an OG after a Bale shot, in the final again Ramos scored vs Atletico and Ronaldo was nowhere to be found. But, he scored a penalty as did Vazquez, Ramos, Marcelo and Bale. Actually he was decisive vs Wolfsburg by scoring a hat-trick at the Bernabeu, but I do not think that is enough to be called one of the best big game players of all time.
- Euro 2016: Portugal were 3rd and in any other Euro, they would have been out by the group stages end, however, as a reward they avoided Germany, Italy, Spain, England and France to only face one of them in the final. They won against Poland by pens, won in extra-time vs Croatia and Ronaldo was not that great in both matches. He was brilliant and decided the tie vs Wales by scoring twice and then he was actually injured in the final. If we compare that to Messi's role with Argentina, Messi reached the final 3 years in a row, lost 2 penalty shootouts vs Chile, he scored in 2015 and missed in 2016. At the World cup, they went to the final and lost in extra time, however, Ronaldo is hailed for helping Portugal reaching the final after finishing 3rd in the group, while Messi is a bottler because he helped Argentina in reaching 3 finals in a row.
As i stated, Ronaldo was very decisive and played the best knockouts I've ever seen in terms of being decisive in CL 2017 and uptill now in CL 2018, but that was not the case throughout his career at all. Sorry for the very long post, btw.