For PvP I totally get it. The A2 is a huge tempo swing for a go 2nd team. The passive is great, even though it requires some building around.
For PvE, sustain champions are often better than they look at first glance. I learned that with Opardin, who carried me through the early game and is still in my CB team. But I just don't see myself using this guy. The comparisons that come to mind are Duchess, maybe Brogni? Either of these is a lot better, as they have more variety in their kit.
As an early game player I'd pick him up in a heartbeat. But I got 63* on the lizard crypt a few weeks ago, and already have Ukko as a reviver with a ton of utility for things like DT hard. Might still go for him because fragment champs tend to be easy, and he looks sweet.