Halo and gears are players count not sales.
Halo is FTP, there’s no other way to gauge a FTP games success other than player count, and very few FTP ever sniff that many players in a lifetime, let alone a couple months
You have physical UK sales which are pretty much worthless at this point, as most people have gone digital and the UK is just one region.In the UK,Microsoft second biggest market,Gears 5 only sold a fraction of what it predecessor did at retail.
"It’s 2019, and the standards for a game’s success are rapidly shifting. Gears 5 sales – at least in the UK – have been just a fraction of its predecessors"
Gears 5 sales are bad - it is also the most successful launch in series history
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Gears of War Series Surpasses 19 Million Sales - IGN
On Gears of War's sixth anniversary, Epic has announced an impressive sales record for the Xbox 360-exclusive.
www.ign.com
Gears of War Franchise Has Sold Over 41 Million Units
Update:It has since been pointed out, The Coalition previously revealed the Gears of War franchise has sold over [...]
www.vgchartz.com
The Coalition has sold ~20 million games between Gears 4 and 5.
No way you can argue the series hasn’t been a success under them.
Their most successful game, is a success. You claimed the games were not sales successes.Psychonauts 2 being double fine bestselling is not impressive given the fact that double fine games don't sell that well.