#5 Bad UI design
The problem: The User Interface is lacking HD quality, missing originality, or confusing users because of it's bad design.
Major culprits: College Hoops series, Too Human, Pro Evolution series
Avoidance: Design UI's to be more efficient, ability to customize, and use selection trees if needed. EA does a lot of things wrong. The one thing they do right is UI design, and the Madden series is proof of that. The background's are always interesting, you never get lost in sub menus and the quality of wallpapers are true HD. By using the selection trees within their menus, players can easily navigate the game options and settings. EA's UI designs are the standard for which all games should be measured.
#4 AI or lack thereof
The problem: Artificial Intelligence within the game leads your cohort NPC's into walls, continual crossfire, or stuck on corners. The AI within the game is either too stupid, or beyond genius.
Major culprits: Gears of War, Mass Effect, Halo 2
Avoidance: Simple taking more time to play test AI at different difficulty levels. For example, Gear of War is one of those games where your AI partner Dom is getting killed every thirty seconds on the Hardcore difficulty. Though on the default difficulty he's not very helpful. Granted, on harder difficulties more of the burden should be put on the player, but that doesn't mean that you should have to babysit your AI buddies either. The drastic dichotomy of AI on different difficulty levels just makes some games either unbelievable or unbearable.

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