Flip Doom Donuts after activating Zero Force to clear all monsters with zero attack or defense off the field. Useful when with the above monsters that won't be affected by Zero Force, allowing them to attack directly.
I don't think the card is "broken".
-You cannot activate this card during the Damage Step.
-You cannot activate this card if a face-up monster is removed from play as a cost.
These are probably the reasons why it's not "working" for you.
To side with him, although im decently new. Ive Dimensional holed a face up atk monster on my side several times and therefore chained zero force several times. Yet it seems as though it very clearly just does not activate. Is there something im missing?
It should always work if you use Dimensionhole. (Unless you set Zero Force that turn or something like Jinzo says otherwise, of course.)
But in addition to what ValleCula said, the monster being banished also needs to be the last thing to happen. So if you chain something like Interdimensional Matter Transporter to another effect, you won't be able to use Zero Force then, either.
No card is "trash." When used properly, they can be very good, its just that people overuse certain decks to the point where most other cards are inviable competitively (resulting in the use of staples). Casually though? It's alright.