is it worth recruiting against a D2 Sim or a d2 human in certain situations ?

Absolutely...I battle Sims a division up when the situation is right (the target isn't tight with the Sim, is close to me, etc.) regularly. Going against a D2 human is a dicier proposition because for a human to be on a recruit, you know there's an intent and interest there. But there's still times you can do it and be the victor (D2 is in multiple battles, you have a significant distance advantage, you have a significant $ advantage (5-6 open scholarships vs. 1-2 open scholarships for the D2), the D2 appears to have entrenched players at the position while you're in a position to offer a start). You can do it, but you have to be A LOT more careful. Most of the time you're going to determine that it isn't worth it. 

thanks for the feedback, i'll prolly just try against the SIM and stick to that, just to expand my current recruiting range..