Gilded Lotus is really, really good in the right circumstances, but its high mana cost means that you have to carefully consider if you really need the big mana income that Gilded Lotus offers
Do not be afraid to try different styles until you find one that satisfies you

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I also agree that Keldon Marauders is mediocre, but I will defend War Marshal as being very good: all those cute things he can do add up
Yawgmoth is the glue that holds this deck together and singlehandedly makes it playable
Niv-Mizzet, Dracogenius is the next for our list rocking that $36.37 pricetag