I agree on all points so far: Launchbox 4.0 looks fantastic, the ExoDOS collection is great, and the MEAGRE frontend is an abomination.
The folks who put the ExoDOS collection obviously put a huge amount of work into it. Every game (3000+) has all the metadata and images you'd want, it's just formatted for a terrible frontend. I've got the ExoDOS "action games" set now, and I'm working on the other sets. If the launchbox devs would be interested in figuring out a way to pull the metadata, I'd be happy to send them the sets.