Or to take your MtG analogy semi-seriously, 4e At Wills are 2 mana creatures. They have that in common.
But the list I produced (and I could have gone way further) includes a wall that literally can not attack (Storm Pillar), one with 0 attack (Astral Flame), one that prevents an opponent untapping (grappling strike) and others.
You aren't objecting to 2/2 creatures because they categorically aren't all 2/2. What you are objecting to is the idea of the mana curve and the lack of rules ensuring that decks are either all 1 mana or all colorless legendaries and artifacts.