What should I expect from my commercial brokers?

[Jace Holt]

I have a question for anyone experienced in working with different commercial brokers for buying mid to larger multi family property. 

I have worked with several now and I have found varying levels of helpfulness. I've had some who will hire and oversee inspectors, draft documents, if necessary work with any government agencies, help with market due diligence, meet with contractors at the property, etc. 

On the other hand, I have had brokers tell me they need me to do virtually everything, including drafting all of my own documents for them to hand to the other party.

I nearly always work buy with the listing broker. I obviously prefer the more helpful brokers as they save me days of work throughout the transaction, but I'm not sure if I should be expecting all of the service some offer me. Is that what they supposed to be doing? I feel funny asking them to do tasks they were obviously not going to do. What all do they do for you? Would this be solved by just bringing in another broker/agent local to the area to split the commission and do all of the work I want done? If I start buying their listings with another agent who splits the commission, will I start losing deals and getting offers rejected I otherwise would have won?

Thanks for any helpful input!