I've been playing SMN lately to practice it for prog on savages. There are a number of glaring issues with the class that I think if addressed could make the class much more enjoyable to play.
1) either lower the cd of tri by 10-15s or the trances by the same amount. This would fix the issue of our DoTs dropping off without an efficient way to reapply them. Alternately they could make it so we aren't extremely reliant on our DoTs being applied.
2) Egi abilities should be able to be used out of combat. Whats the point of a titan shield if I can't shield myself prepull. No will ever switch to titan just to apply the shield and lose all the potency from ifrit.
3) tie aetherflow to our trances so it actually feels like it has a purpose other than just being another set of ogcds to spam.
4) Increase a few of our potencies by a little bit, it's incredibly feels bad to be playing a class with as complex a rotation as current SMNs and to be so low on dps.
5) Don't make us lose 1/2 our skills while we have a demi summon. or at least allow demi summons to cast devotion.

I've started to enjoy the chaotic nature of the current SMN rotation. I like that there are higher skill cap jobs, but what's the point of an incredibly high skill cap if no matter how well you play it you just aren't performing nearly as well as much easier jobs (I haven't played every class, but from what I can see SMN currently has the most complex rotation in the game)