During the Skyrim craze all my friends were playing and loving skyrim, they used to tell me it was the greatest game ever made. but it was never my cup of tea. I know it is probably a holy grail and an awesome game but I never really caught on to it or had the time to play it. I wasn't a fan of any of the Elder Scrolls games for that matter. I didn't really like it. It felt tiresome and almost a chore at times.
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Assassins Creed, I always found myself getting bored quick with all the AC games I played, aside from III. I loved III for some reason. Many people tell me III was their least favorite but for some reason i loved the plot. But 1, Revelations, Black Flag and Brotherhood were all played out to me and I never really loved them. I could always take them or leave them. My friend used to sleep over and he was a die hard AC fan. i tried to love the series and get all the trophies but i never could play more than 4 hours without putting bioshock in lol.
Gears of war- Being an xbox fanboy, i always try to push myself to love gears of war. but imo the controls are clunky, the plot is meh and i much prefer Mass Effect or ever Army of two over gears. Imo it is a really overated 3rd person shooter. Was never sold on the series.
My tastes are pretty weird sometimes, these 3 games are critically acclaimed so i am probably wrong about them. but those are 3 i gave fair changes to and was underwhelmed with.