You must be delusional to believe this. The season before Ronaldo joined Madrid they were being THUMPED by Liverpool in the CL home & away whilst being humiliated by large scorelines in El Clasico. Barca at the same time were playing their best ever football and winning the treble. There were a number of clubs better than Madrid before Ronaldo moved there including the team he left behind while Messi's team were the undisputed top dog in Europe. Ronaldo joined at the beginning of a project which saw some of the biggest transfers in football history completed in one window.
I'm not delusional, I know the story of both teams, the contexts and remember better than you.
"They were thumped by Liverpool and humiliated by large scorelines". Let's see what you need to kill Real Madrid
1) You need them to fall into complacency after winning 2 leagues, last of them setting the, at that moment, points record (85) with a mediocre coach like Schuster
2) Their star striker (RVN) getting injured in November for the rest of the season
3) You need to demotivate his coach with some precious football, to the point of him claiming "we have 0 chances to beat Barcelona in El Clasico", so he gets fired.
4) Turn them into buffoons in the winter window, because they signed two players and didn't know how the UEFA/UCL rules worked (regarding Lass and Huntelaar, who Real signed to cover for RVN in Europe but couldn't be registered)
5) Have the luck that their president (who won 2 leagues vs you, despite being awful) gets caught by Marca on assembly fraud and resigns, opening a crisis in the club
6) Have their incumbent President put pressure on his players and motivate Liverpool by claiming
"We're going to win the league and the Champions, we're gonna win 3-0 here and 1-2 in Liverpool, they'll have to attack and we'll piss over them"
7) After lossing RVN for the season and Robben (their best player) for 5 games in November, having their coach sacked saying his team wasn't good enough to face Barcelona,falling 12 points behind Barcelona in fixture 15, being eliminated by a 3rd division team in the Cup 1st round, their president resigning for fraud, exposed for idiots in the transfer market and a clown in charge saying nonsense...
You still have to go to the Bernabeu, in match day 34, and kill them with one of your best games ever, because they've been in a 52 points out of 54 run in the last 18 games, and they were just 4 points behind you.
Let that sink in, you're Barcelona, you're having your best season ever, everyone is praising the way you play, you have the best player in the world and your rookie manager seems to be reinventing football, but you still had to go to the Bernabeu, to play a once in a lifetime game to stop the bleeding against a team that was supposed to be dead in December.
Now tell me, you think a team that was able to fight back Barcelona in "the best season ever" had no saving graces and was as bad as you're saying?. No other squad in the world would've survived that amount of turmoil and fight until May against what was regarded the best team ever, and it's not like it was a great manager who performed a "Fergusian" miracle, we're talking about Juande Ramos.
You think that same team turned into a 96 point machine the next season just because of Ronaldo?. That's as ridiculous as saying Messi turned a 67 points team into treble winners on his own in 12 months.