It was originally a full-priced retail game before going free-to-play. Besides, even the free version pretty much forces you to pay.
Wasn't Tank! Tank! Tank! an arcade port though? And for that matter, did you also hate Alien Front Online?
Never played Alien Front Online, but looking at gameplay footage at least you can turn your tank's turret. You can't do that in Tank! Tank! Tank! - even your aiming is completely automatic, meaning the gameplay is just mashing the fire button.
Super Nes - Home Alone I'm not sure what to hate most about this game. Instead of making a game where you catch burglars with booby traps, they made a hugely generic platformer. It's amazingly bad. NES - Robowarrior* Imagine Bomberman, but single player, limited bombs, random powerups and hidden items you have to find to progress. You can play the game perfectly and still wind up failing due to how the random powerups appear. As a kid a few bite marks made it onto the controller due to this game *I actually really like this game now, because I can go online and see where the stupid hidden powerups are. I'll 1CC it one day...
These are the worst titles that I've owned & played for each system: Sega Saturn - Magic Carpet, I'm sure there's worse Saturn games but damn this game is terrible gameplay and graphics-wise, so much so I couldn't stand more than maybe 2min with it on. Maybe I just have bitter memories of it. N64 - Quest 64 (in my opinion one of most unfun RPGs I've ever experienced) TG16 - it's a tie between China Warrior (So boring & lackluster is all I remember thinking) and Yo Bro
Any game on the PCP/Popstation - surely nothing comes close to beating that in the 'worst games' department simply because they're all completely unplayable.
Of games I actually owned. NES - Bayou Billy. Difficulty was ramped up well beyond any point of sanity for the US market. Genesis - Some Sega CD Star Wars game. Awful FMV shooter. N64 - Carmageddon 64 compared to PC it's total garbage. Dreamcast - Sonic Shuffle 360 - Vampire Rain, intentional purchase bad early gen game. Horrific optimization, ripoff of many other games in one poor package.