How good (or bad) would Hastarii be if you could run 10 man squads?

I don't know if it's cause I haven't played too much, but they feel like they're lacking a little extra "oomph". The 1 or 2 attacks each feel too coin-flippy, even with marshal rerolls. Maybe it's cause I've only played at 1k, but I find it hard to dedicate a second marshal to them.