He is more correct then you would think though; pusillanimous 1. lacking courage or resolution; cowardly; faint-hearted; 2. proceeding from or indicating a cowardly spirit.
I don't like Arfus but its kinda decent for a kazakus style deck or quest mage. Getting Army though would be shit in anything but warlock. I don't consider the death knight cards on average to be worth the weak body.
Jaricko ysera gives you always removal or minions, which is great in control, while lichking gives you like 10 different cards with different effects. you are far less likely to get the cards you need in that situation. ysera > lichking. did I mention that half of the lichkings cards mill yourself?
Its a silence priest. Its fairly simple enough to throw together. Lyra package, usual priest cards, big bodies to silence and draw cards off of. I think it also runs dragon fire cuz dragon fire too good. Probably no DK since you you wont have the 0 mana hero power to make full use of it. Not very likely but also possible arcane giants.
I never hope in arfus because it's a really expensive card. 4mana for a 2/2 is the slowest i ever seen. If it's cost is 2 or max 3 thats ok. The lich king's cost why not 10?