"Well no, there isn't "I win" jobs per se, but I would argue there certainly are a few jobs that contribute less than others or just don't jive in Frontlines. Namely, RDM, SGE and to a lesser degree DNC, MNK, RPR and even SCH under circumstances."

My comment was towards someone thinking that choosing one of those 5 roles would swing a match or improve their win/loss ratios. it might or might not, as I was trying to say- if you're not comfortable playing that job (it doesn't feel right for you), or you don't understand how it works- then it doesn't always matter how "high impact" it is. You can potentially be better off playing a job that is a better fit for you, even though it may have some drawbacks.