Ion weapons on a huge ship that shoots forwards. Yes, one crit isn't much bang. Personally think it should have been two ion tokens so it could ionise larges in one shot, but I get why it isn't (would be too potent against other huge ships, ion weapons inhibit energy regeneration). But bear in mind it's a 4 dice ion weapon for a huge ship with no no agility doubling a la single turbolasers and no range modifier because it's a secondary: it's probably going to hit.
I'll rephrase that: Ion weapon that's very likely to hit (and ionise) at reasonably close range in the forward arc of a huge ship.
That B-wing may scoff at that single ion token, at that single crit that's near harmlessly absorbed by the shields. But it won't be laughing a turn latter when it gets splattered on the Raider's windshield.
Frankly, any pilot that gets near ramming range only has himself to blame. Even with the Corvette and Transport you want to avoid the front to avoid getting pac-manned.