It's true that a standalone spell that costs five and creates a 3/3 Flyer would be below the curve, being a prepare spell attached to another Creature is much more interesting
Additionally, with I Trust You, you can look at the top two cards in your deck when she quests
Lands commanders can also give you a new way of looking at lands, seeing them as resources beyond the mana they produce
It reminds me of Wizards of the Coasts older Commander precons, which were often more like two or three half-decks in a trenchcoat (the idea being that players would play a few games, get a feel for which mechanics they liked and then start swapping in cards to emphasize that part of the deck)
kill about one-third of common creatures in this set, it wipes out tokens from cards like Prince Imrahil the Fair, Shadow Summoning, and Horn of Gondor