I think he was mocking Mass Effect for it's supposedly shallow companions in comparison to earlier BioWare games.
Whoever said that Mass Effect has shallow companions? :huh: It boggles the mind.
Deeper companions would be nice, but quite frankly? Bethesda has always kinda svcked at creating companions.
See, Bioware's games use their characters to tell the overarching story, necessitating the kind of personality depth that their characters are known for -- especially in Dragon Age and, to a lesser degree, its successor. Bethesda has historically focused on telling lesser stories through the world and its lore, while enabling the player to explore and make up their own story on the side. Bioware = people-based, Bethesda = world-based. These methods each have their pros and cons. Bioware tells a better story but constricts you, Bethesda gives you a large amount of free will and choice with less story. I love the RPGs made by both companies, but it's not really possible to combine the two and do both well -- at least, it's certainly not been done to date.
Bethesda has other priorities than further developing the personalities of it's companions. They would probably do it badly, and in doing so, they'd have less time to spend on ensuring that the player has the choices and opportunities that you expect from an Elder Scrolls game.