This is a complex card. The reasons you'd include him in your deck are also complex.
Obviously, if you're planning on giving the corp bad publicity (which, as of this writing, now that O&C is out, is quite doable) then he has some fun (if janky) combos. The big issue is that bad publicity is still difficult to land, so he probably won't give you more than a few extra accesses per game. (Although he does combo fantastically with HQ Interface or a preloaded Nerve Agent.)
His other ability, (trash for expose) is more likely to be useful. But there he competes with Infiltration, which is not only zero cost, but can be used to GIVE you money, if you don't want the expose.
So why would you use Raymond if you're not planning on bad publicity?
A few reasons.
1: He's a connection. If you're building a deck around connections, (probably because you want to use Calling in Favors) he serves brilliantly.
2: If you're using The Supplier, he's effectively free, at the cost of telegraphing your ability to expose.
3: He doesn't cost a click to use. This part is really where he proves his worth. You can put him on the table when you have a free click, and then later, if the corp puts down something that might be an agenda, and might be a trap, you don't have to spend a click exposing it. You can just check, and then if it IS an agenda, dedicate all 4 clicks to getting where you need to go.
He's an interesting card, and he definitely has his place. And if self-inflicted bad-pub ever becomes too common, he'll be a good counter. For now though, he really only fits into a few very specific plans. But for those plans, he's really quite good.