Well you just need to be lucky. I played early this week with my interceptors. I was against a pretty standard competitive rebel list. Wedge, 2 Blues, one Rookie. He consistently rolled 3-4 hits on his attack dice, while I rolled normally one.
I then played a fun game where I put down 200 points and my opponents put down all 3 named YTs and a couple rookies. First two shots from them gave me 10 damage.... 4 Crits from a concussion missile, and 2 hits and 2 crits from assault missile that also got 2 TIEs in its splash.
The problem with Interceptors is if your luck goes south, or your opponents luck goes hot, you're dead. You don't have the hit points to soak it, and it is impossible to keep out of the arcs of all 4 ships of a good player.