His portrayal of the self aware hologram Vic on DS9 was always a highlight for me. In the midst of an ongoing war epic, they’d sprinkle in moments for Fontaine to cheer/distract the crew and audience. His beautiful voice helped Nog through the loss of his leg and the PTSD incurred from battle. He got Odo to remove the proverbial stick from his ass. Plus, he helped to orchestrate a ridiculous heist on the holodeck in order to save his program. He will be missed.
I mostly liked the character— it was his singing that I couldn’t stand. His voice sounded like several tons of gravel slowly sliding out of the back of a dump truck onto asphalt, mangling some of the best crooner tunes, the originals which were sung with Sinatra’s silky smooth voice. I always skip past any time he sings— it’s unbearable.
He’s a fine actor, though. I really liked the episode with Nog and helping him with his PTSD. Some of the other writing was problematic, but not his fault.