People have stated that the Y-Wing dial is terrible so many times it is accepted as true, despite it being a perfectly workable dial. It has a white turn, 3 of the all important 1 speed maneuvers, a long enough K-Turn to come around after a joust effectively, and a 3 bank to dodge arcs. It doesn't have a lot of green, but unless you are running stress upgrades the lack of green is pretty much a non-issue.
The Warthog is an absolute monster if you find yourself in front of it, and it doesn't need an action to be effective. Making two attacks means you have one unmodified vs. modified attack and one unmodified vs unmodified attack, meaning losing your action is more-or-less half as problematic as it would have been. Consider that a Y-Wing doesn't generally need an action for defense either, and action economy in a Warthog vs. Snub fighter actually tilts towards the Warthog, especially when you k-turn. If you run multiples, the action advantage stacks up rapidly in favor of the Warthogs as they focus fire on one or two targets.
Now, consider that a 23 point Warthog has a higher damage output than a 3 attack ship, better action economy, excellent survivability, and adds an ion effect to the damage and you will realize the Warthog is a major threat.