The thing about Fandaniel is he plays his part in the story very well. He is flawed, incompetent, emotionally driven, and will always find a way to screw up as a result. I'm even willing to bet that losing a shard to the void was very likely mostly his eff up. Nobody was more suited to bring back their lord only to lose him immediately; then go on to think his grand scheme was fulfilled, only to lose completely in the end.

They even chose the most rotten, hateful, rat-arse piece of scum to house his essence. Trust me, everything you feel about Fandaniel is intended.