I never feel very effective with SRMs.
I was told the Owens B was pretty nice as a starter mech. I emptied all my SRMs furiously at everything I could, and by the end, was still a goddamn CDT. I didn't feel like I really did any appreciable damage to anything.
SRM Mad Dog is fun because it's missile mayhem, but I don't think I've ever actually died to that thing.
I'm way more terrified of MRMs.
Also, protip: MRMs are the absolute cheapest weapon per missile per salvo in MWLL.... SSRMs are the most expensive, four TIMES more expensive per missile per salvo than MRMs. They fire faster, but I'm not a fan of weapons that drag their usefulness out because that just means more time to get killed before I finish the job.