Only watched them a couple of times, against PSG and Marseille. In both games they were quite good, Pitroipa like you said is vital for them in attack, his pace and trickery have been a handful for Ligue defenses. Montano has been good too, a nuisance to defenses and has scored his fair share of goals. They play fast counter attacking football, and neither PSG nor Marseille were able to beat them. Will be interesting to see how they fare against Atletico next week.