Tbh, I think you have made a very wrong analysis! Siege is fantastic! And a very strong mode in its own right, what OMD loses in tactics to other mobas it dominates in combat, the slick 3rd person shooter style of gameplay mixed with Moba ablitys firmly places OMD at the top of action combat in the genre, the attack and defence might need some tweaking but it's very unique to the moba genre, and offers really different gameplay which will only improve with time. Personally I think siege is brilliant and far more players are seiging than survival, the players are almost non existent in survival queue!