I've never played the Pancakes, but I've watched them from afar. I've never cared for them. In my main save, Bob wasn't too bad, but Eliza was always so annoying in my game.
Though I never directly played them, from the outside their marriage didn't seem great. Eliza was always at every single nightclub my Sims went to, flirting with everyone. I've played plenty of households where Sims had a romance bar with her.
I killed her off after awhile because she irritated me so much and I was tired of seeing her face at every venue my Sims went to, regardless of the world they were in. I actually started seeing Bob more out-and-about after that happened, almost like he had been freed from her chains.
Too much time has passed since the start of that save, though, so he's passed on as well.