Ignoring the lack of updates if the game is buggy, games back then were also more focused on quality and make gamers replay the game with unlockable features based on skills, not money. I can't count the number of times I played Metal Gear Solid games over and over to unlock new features playing the hardest difficulty and with handicap features, and also to find Easter eggs. Speaking of Easter eggs, you'd lose a number of hours exploring every nook and cranny finding them!
That's commonly said but ignores other economic factors such as income, unspent money, and cost-of-living.
Though lots of things are better now: the entire back-catalogue of games, more access to review/forums, free games (and also ability to create your own games without doing so from nothing) etc. Aside from when video store rental was applicable, early gaming was more take-what-you-can-get (niche hardware/platforms might still have that feel somewhat).
Inflation is derived by indexing all of those things. Some things are far more expensive or far cheaper relative to each other, but we approximate the buying power of a dollar by looking at all of it.