IMHO Disgaea is the best series of strategy games on the planet. (Not that I've played every single SRPG out there, but I've played quite a few)
It never fails to have an awesome storyline
The characters are lovable/relateable/loveably hateable
The sheer depth of the gameplay is staggering.
Standard SRPG
Level Cap: 100
Items: all identical (A Potion is a Potion)
Sidequests: a few, one or two only possible on new game +
Weapons skills: either unique to character or job-related
Disgaea
Level Cap: 9999 (Not a typo, dood)
Items: fully customizeable, able to be levelled up
Sidequests: Many, MOST of which are only possible on new game +
Weapons skills: Fully customizeable. You can give an archer a staff if you want to. She may not know how to use it, but you can!
Anyway, I love to talk about Disgaea.
As you might have noticed. I'm also a fan of FFTA/FFTA2.