Part of the problem I found with DRG and NIN vs MNK is that... MNK, if you hit bootshine while behind your target, but a tank turns it so you hit the flank, it still registers the auto crit the majority of the time. For DRG, if you use heavy thrust on the flank, and the target is turned to have its rear facing you... It never applies. Same thing goes with NIN's trick attack. Can't tell you how many times I have been running my dragoon because I find it fun, and bam, need to use heavy thrust 10 times because of that.