Useless rolls

[Yinnyth]

haste samba does the same thgingand people still use if and since it not haste it - delay it stacks with haste, haste samba, and marches

Samba counts as job ability haste. I believe hasso and Apocalypse's aftermath also fall into that same category. Blitzer's roll lowers the TP you gain per swing, haste samba does not. Also, 'borrow' is spelled with two 'o's.

[Mirabelle]

Blitzer's may lower your TP per swing but it doesn't lower your rate of TP gain. Since the TP formulation favors lower delay weapons, it will actually help TP gain slightly (much like DW). It will throw off XHit builds (just like regain will) but seriously who fusses about X Hits anymore?
For 1H who haven't reached delay cap and are getting high crit%, Blitzers would be a very good roll. Certainly I use it soloing on COR since I only have gear and Samba Haste in that setting.
AS far as useless rolls are concerned: Gallants, Allies, Coursers, BRD are the most useless. Pet rolls are highly situational. NIN, MNK, Magus all can have uses and I wouldn't skimp on them. I'm finding WHM and SCH rolls to be my least used mage rolls as I prefer Fast Cast/Evokers/MAB to be more useful. MACC roll is situational (i.e. you brought along some gimped mages lol).