Utility creatures, offensive creatures, defensive spells, disruption tools, and facilitator spells are the most common playable one-mana options
Esper Sentinel, Imperial Recruiter in Human decks Esper Sentinel punishes any deck looking to interact and is best supported by disruptive creatures to leverage the additional cards you may draw, making Humans the perfect home for Esper Sentinel
Its not very fruitful to dig into this too deep, as the answer will mostly be some version of people whine too much. Instead, Id like to look at the crux of the issue: is the deck doing something fair
Legendary Creature - Warlock Tiefling Commander (CTRL to add secondary) Drain Marionette Master Fabricate 3 (When this creature enters, put three +1/+1 counters on it or create three 1/1 colorless Servo artifact creature tokens.) Whenever an artifact you control is put into a graveyard from the battlefield, target opponent loses life equal to this creature's power
I can also cascade into some recursion with Grim Harvest, Macabre Waltz, and Soul Manipulation