is my marauder alts gear right now, and I've also cleared every boss in the game (except EC NiM kephess) on my main. Do you think he's not geared enough for SM ops? How about after I get the 2 might hilt 27's I'm planning to get crafted for him, which would still put him under 1800 strength?
I would hazard a guess that you're probably a skilled player who is very familiar with the fights. This is based on your saying that you've progressed mostly through NM EC (and everything else). Also, I'm pretty sure the others in your raid group probably have better gear than you do.
Anyway, a very skilled player doesn't need ideal BiS. However, when you're filling a pug slot, with an unknown variable of how good someone is, it's safer to err on the side of caution.
My own raid group is mostly Dread Guard and we're still progressing on NM EC. The only way we'd bring someone geared like yourself is if someone knew the player personally and was willing to vouch for their skill.
Edit: I also fiddled more with AMR profiles for Marauders/Sentinels. Their gearing seems weird to me. Stock Columi gear on a Marauder has vastly less main stat than other classes.