For me the answer is no, I was fortunate to really get into football (and watching Utd) just before the class of 92 (was 15 at the time, fan from about 8yo but not much access to it) so when I think of legends I have a lot of names on that list, Ronaldo is not even in the top 30 when it comes to how I feel about the players I have seen at Utd.
I think the way in which Ronaldo left the club to go to Madrid is overlooked and brushed aside by many, for Utd he was nothing but a journeyman and we were just a means to an end, I cannot deny how destructive an attacking force he was for the last few seasons he was with us before leaving for Madrid, but the way in which he left will always prevent him from being labelled a legend.
I am sure that many will disagree, but for me part of the legend tag only exists when there is a deep connection between the club, the fans and the player.... see the way that players like Evra and Cantona adopted the club and even now are deeply connected to the club, (not saying Evra is a legend) for me that connection has to exist to be a legend, and Ronaldo has never had that.