The accent was pretty cringeworthy. It's like when Londoners (i'm from the UK) get so 'into' something that they go full on cockney and deliberately draw out every single word and say it with exaggeration. You also see this kind of behaviour a lot when someone is mixing with a member of that particular group when they otherwise wouldn't and as a result wouldn't normally talk that way. Say for example someone who usually makes an effort to enunciate things properly starts chatting with someone who talks with a thick accent - the former will deliberately adopt that drawl in order to show connection with the latter. I think that's what Bob is doing - adopting his thick Boston drawl to show his deep connection with and interest in comic books. I personally can't stand that and have never done it myself, but i suppose we can't really bag on Bob for old habits dying hard. It's probably more comfortable to talk that way. Still, we have "TV voices" for a reason and when presenting a ten minute or so video people are generally expected to talk like a news presenter.
Interesting video. As always, i love these Big Pictures, even if i personally have no stake in anything that's being said - i've never really understood the appeal behind comic books, for example, yet i still find 'comics are weird' episodes to be entertaining in their own right. He's right about not having to start at the beginning when it comes to continuity. It's not quite the same, but how many people do you think enjoyed Fallout 3 without having played Fallout 1 and 2 first, for example? Though if people love something enough they will always want to hit that reset button and start from the beginning. To deny that is to incur great frustration for the fan, which can cause them to go from 'new reader' to 'non-reader' if they feel they will never be able to be in the same position as the 'old reader' who has been there from the start.