A fair assessment, I think. The networking features in DragonRuby are not among its greatest strengths.
It was very brave of you to make a multiplayer game for a game jam. In other jams (with more participants) I’ve seen people struggle to get players online at the same time. One solution I saw was the game dev giving their contact details and offering to play against anyone who was interested. The best solution I saw was a game where the multiplayer was not in real-time but recorded so you compete against the last 99 players.
I’m glad you liked DragonRuby. I like it a lot, as you probably guessed, and I hope you continue to make games with it. Either way, I wish you great success with your future games.