I like a realtor who can find deals that aren't on the MLS and won't BS with me. Anyone can do MLS. A good realtor who has enough networking to find that diamond in the rough is worth his weight in gold and will probably get him or herself the buying and selling commission from me. I could care less about your pulls from the MLS, I can do that in my sleep and every single realtor does it too. It spams my inbox and is worthless, I don't read that stuff. All I want is that one good deal from you and you should be bringing it yourself without all of the automation. This is one of the things that David brings up in his Long Distance Investing book.
Couple of other things. Don't assume I'm like one of your other clients. I'm not just some guy that is trying to find a house for his family. I'm trying to build an empire. Don't treat me like a newb or I'm already out. There's a good amount of respect that has to be shown.
After that, do your research and disagree with me when I'm wrong. I've had agents approach me with totally wrong numbers in their comps and then I question them on it and they don't have an answer. It's one thing to disagree and stand by your numbers with actual analytics, I love that kind of conversation because we both learn from it. It's another thing to pull something out of thin air and then not substantiate. I would rather have a realtor who surprises me with science than one who strings me along and assumes I'm not going to do due diligence.