Would it be unfair to argue for the PS2? People only remember it for its sales numbers but there's a good reason besides DVD that it won by miles. Not to say it's the most underrated EVER, but it could be listed without too much of a struggle
You should check out my YouTube channel, The Golden Bolt! I review all types of video games, both classic and modern, and I also give short flyover reviews of the free games each month on PlayStation Plus to tell you if they're worth downloading. After all, the games may be free, but your time is valuable!