Certainly (I'm prejudiced) Guild Wars 2 is an incredible value for a small amount of $$ !
"Brianna Royce: Guild Wars 2. This has been my nomination for the last many years now, and it’s still true: There is no MMORPG on the market right now with this much content with a cheap buy-to-play model and a totally skippable cash shop and no sub. It’s a low price with extraordinary value, and that makes it perfect for families, which is exactly why my kids play with me. The only other MMO that comes close is Guild Wars 1, and that’s not an accident."
A shout-out to OG Guild Wars as well!