NBA 2K games. Terrible loot system that never gives you good stuff until it enters endgame near the end of the year. Then they turn off the servers a few months later and force you to buy next year's game that has the same graphics and a slightly tweaked playing mechanics.
But I honestly personally spent quite literally hundreds of hours on that series. Mainly cause I'm a huge NBA fan and I love building out custom teams and there's not much competition in realistic basketball simulators at the moment.