I wasn't completely disappointed with this. Of course I haven't seriously followed or watched Family Guy in years.
Stewie and Brian's adventures were the only thing worth watching any more anyway.
And Vinnie is likable and actually has like, genuine character traits and no ulterior motives towards "replacing" Brian.
If they're gonna do something like this, they need to stick with it and take it seriously, like they did with the trapped in the bank vault episode. I don't want any future episodes where Brian comes back to life and seeks revenge on Vinnie for replacing him, I swear to loving god.