Currently playing through Super Robot Taisen OG Saga: Endless Frontier on the DS (what a mouthful). Sometimes you need to buff up a level or two for bosses, but honestly grinding is fun as battles are really involved. You don't just pick a command and watch, you need to link attacks in your chain to keep the enemy in the air so they don't land and interrupt your attacks with a free counter. Then there's decisions on whether to link to other characters to increase the chain which increases the damage but takes away the opportunity to use items or whatnot, and lots of other stuff too.
It's really fun because it does things differently, sorta like an RPG crossed with a turn based action/arcade game. Plus the anime isn't over the top and has older main characters who are really interesting and funny, as opposed to the typical emotional/whingy teenager types that seem to propogate a lot of Japanese media (the main reason I haven't finished The World Ends With You yet).
Disgaea DS on the other hand... Level cap of 9999 anyone?