I watched this OVA on YouTube. The video had a terrible 240p resolution and the subtitles were the most retarded Engrish subs ever made, making sometimes impossible to follow the dialogues due to the barely understandable/nonsense translation. This made the whole experience quite painful, seriously limiting the overall enjoyment, but the anime is decent. Rokudenashi Blues is just another obscure and hard to find OVA from the early 90s. It's nothing special: very short and with a simple plot, it features some classic high school gang-related violence. There isn't much room for character or plot development because the OVA is about 30 minutes long. Artand animation are fair enough for an anime from the early 90s. The overall enjoyment is enough for this anime to be worth watching.
Recommended if you're into minor and obscure OVAs, if you like the 80s/90s style animation and/or if you want to watch something entertaining but you don't want to start a TV series or a long movie.