I felt as if mono green infect is very fragile like MrENigmas said however going B/G gives you much more options. Having access to abrupt decay helps with threats that you might be facing. I myself, run B/G with the intent of turning it into BUG once I get the funds.
It may not help experienced modern players but it sure does help modern players. I'm fairly new (couple of months) and by buying this deck (which I will), I'll be getting a lot of modern staples that I can use in other decks. Saying this doesn't help modern is going a little bit far. The value is there, even if it's not particularly valuable to you. For new players who are trying to get into modern, this deck isnt half bad.
The more I read these forums, the more I come to realize that MTG players demand so much without thinking about other types of players. Eh either way, it's good for me if people don't buy it, the MSRP might go down instead of wildly inflating like the Mindseize EDH deck.