@rojazu You stated that much more succinctly than my response. My point was, horizontal decks are weak on centrals. They can't rely on consistent economy and their centrals are weakened by typically low ICE counts and the need to protect some high-value assets.
Whizzard is played because of CtM and Anarch cards like Faust, Medium and the various ice destruction suites, and his identity happens to also be very good against any corp running assets. Tournament CtM isn't asset spam; it's an economic pressure deck that uses a collection of high-value must-trash assets to force the runner to lose clicks and credits via trash costs and tag removal. When it achieves an economic lead it uses it to score out through various tag punishment effects. That's not asset spam.
Asset spam is IG prison, Gagarin hot tub, and NEH of many varieties. It's more of a throw what you have in hand at the wall and see what sticks strategy. I don't feel comparing these decks to CtM (and Whizzard's high amount of play) is very productive.
So really, there are two kinds of horizontal decks, and they require different strategies to beat.