Which season?
In the two titles we've won post Ronaldo - The 2010/11 season we were the highest scorers and won 1-0 3 times. The 2012/13 season we were also the highest scorers and won 1-0 4 times. 7 out 76 games doesn't seem an awful lot to me.
Mourinho has never been the out and out top scorer in any of his seasons in England - but we're going off on a bit of a tangent here. It merely comes down to whether you are happy to employ a manager who will win at any cost, or take the risk and employ one who wants to win but is determined to try and do it with style. I'd rather risk the second option.
Mourinho's teams can and do play attacking football. There's this flawed perception of them being cagey to a fault which has been regurgitated so many times that the narrative is already cast in stone. Yes, he has the propensity to metaphorically park the bus when the occasion calls for it, especially in high stake European matches, but so does every successful manager. Pragmaticism and building a hard working base for the side or promoting team work is a requirement at times to gain a tactical advantage vs opponents who might have superior personnel/ form.
Anyway, here are some of the goalscoring stats from his managerial career in the major leagues :
Premier League with Chelsea :
2004/ 2005 : 72 goals scored (2nd highest in the league behind Arsenal who finished 2nd on points).
2005/ 2006 : 72 goals scored (tied for highest in the league with United and we finished 2nd on points).
By comparison our 2007/ 2008 team scored 80 domestically and the 2007/ 2009 scored 68 and we won the league in both seasons. As you can see there's not a major difference in terms of proficiency in front of goal.
Serie A with Internazionale :
2007/ 2008 : 69 goals scored (3rd highest behind Roma and Juventus who finished 2nd and 3rd on points respectively).
2008/ 2009 : 70 goals scored (tied for highest in the league with Milan who finished 2nd on points).
La Liga with Real Madrid :
2010/ 2011 : 102 goals scored (highest in the league, even more than Pep's magnificent Barcelona side that finished 1st on points).
2011/ 2012 : 121 goals scored (highest mark in the 85 year history of La Liga, this is a great accomplishment considering some of the teams that have played in the league).
Premier League with Chelsea :
2013/ 2014 : 71 goals scored (3rd highest in the league behind City and Liverpool but it's important to bear in mind the striking option available).
2014/ 2015 : 56 goals scored so far (tied with City).
So to sum that all up, in about 8 seasons his teams have been the outright highest scorers in 2 seasons, tied for highest thrice, 2nd highest once and 3rd highest twice. Not too shabby by any standards. There is no inherent virtue in being an extravagant 'risk-taker' if the results suffer as a consequence. There's nothing tangible to be gained by losing 2-3 instead of settling for a 2-2 raw. The most important thing a manager can do is alter his approach to suit the personnel (not individuals) he has from the perspective of a team and build positive momentum in terms of results. And that's something Jose is adept at.