He's as good as he seems, but forget not the risks involved.
faction characters have typically struggled for good ally options that dont lead to bankruptcy, Leo De Luca is nice but he's inconvenient in many decks, Lola Hayes and Delilah O'Rourke are 3 XP and drain your resources pretty much immediately. The other in-faction people are rather... disappointing.
Enter: Gregory Gry.
- Sanity tank. Check.
- Resource generator. Check.
- Manageable price. Check.
- Throwaway. Check.
Yeah this dude is definitely something you should try out, especially in a "succeed-by" archetype. Just a little pointer though. Dont go crazy with the 3-resource gambles, do it piecemeal with 1 or 2 resources unless you have a pressing need to fund a big gun or something.
IS he better than Leo? Leo is probably better overall, but you can fit Greg into way more deck archetypes or even both characters together, once you've got all the money off-of Greg you'll be glad to take some more damage on him, unlike other characters that you'dd usually cling to like Ashcan to his dog.