First four races of your rookie season, Lorenzo 2008: 74 points
First four races of your rookie season, Marquez 2013: 77 points
But what I find interesting to observe here, is that JLo had a dream debut – that lasted for the first 5 races ONLY. And after that, it became much more complicated for him. He scored 94 points out of his first 5 races (18.8 on average - an amazing figure, although MM has an even higher average right now!), but then JLo´s total score, from the remaining 13 races to come after that, was only 96 points (7.4 points per race). In fact, after those first 5 races, he only got 2 more podiums all year. He finished with 190 total points, but almost exactly half of those points he had picked up from his first five races!
Is this comparable to Marquez? Other than both were rookies stepping up to MotoGP and making impact straight away, it is probably not, as MM rides a different bike, and almost everything else including the engines, electronics and tyres has changed in five years, too (a big factor: JLo still had Michelins that year). And MM appears very mature in almost everything that he´s done in MotoGP so far, just took podium in the wet with almost no prior wet riding experience on that bike. Almost unbelievable. But I guess JLo´s painful later part of 2008 goes to show, that it is POSSIBLE for a talented rookie to have a truly stellar entry into the series, and still not dominate straight away. It´s still a long season ahead for everybody.