EA easily. The Queen of generic sports and shooter titles. Even their better showings, like the Star Wars Battlefront remake, are all style over substance
Konami is a logical vote but unfortunately Konami just doesn't MAKE many games anymore so its hard for me to consider them triple A at this point. They aren't releasing anywhere near enough games to put into the AAA category, Capcom and Sega release wayyyy more than Konami has in years. And the only big game Konami has released in the last like 5 years was the latest Metal Gear installment. Konami is dead as far as the gaming industry is concerned, and Bomberman R doesn't change that
Hard for me to shat on Activision when they've put out some colorful big titles recentely, Overwatch.
I almost picked Ubisoft because they had SO many years in a row of terribly blah looking toward climbing games that all seemed the same. When Farcry and Assassin's Creed feel extremely similar but are plot wise opposites- that's a problem. That said Ubisoft has seemed SLIGHTLY better recently as far as variety. Maybe I'm just blinded because they didn't do their yearly shitty AC installment.... ....
I think Ubisoft comes out with the most subpar games in general, they don't really ever try to excel.
But I think EA, being bigger, sets such a terrible precedent with all of the microtransactions, deluxe editions, and the concept that all you need to do is license a big IP and you'll get a free pass by reusing assets (particularly with their sports franchises). So I picked them. Their games are usually polished but absolutely stale and since EA is one of the biggest players in the industry they should be expected of a lot more. Not to mention they absolutely fucked up Bioware