Ivo... eh.
I liked him in the Detroit League, and I like him in the Young Justice cartoon (and I do have a love/hate relationship with that show, so it's a decent compliment), but in most comics he's kind of meh.
When he's good, he has this egomaniacal mad artist thing going on. Plus that whole unpredictability thing. A short, ugly weeny looking guy who's smart and ruthless enough to kill half the Justice League if he's in a bad mood.
But when some writers latched on to his whole immortality thing and thought it would be so "clever" and "original" to have him now want to die, even though he's been immortal for, like, two years in universe... yeah, not so much.