"Jason Watkins and Robson Green - a thrilling thriller - but I’m now too scared to go to bed!," wrote a third.
However, the frightening aspect of the show isn't even the worst complaint for TV viewers.
Grantchester fans stunned as Emmerdale favourite makes appearance alongside Robson Green
Robson, 60, is known for his high-profile detective roles in Wire in the Blood and Grantchester.
Many fans of the star could not believe that he was cast as the main antagonist in the new series.
Another user commented: "Really enjoying this series #TheGame but I don't like #RobsonGreene being the bad guy. He's so lovely. Brilliant acting by both him and #JasonWatkins."
"Is it just me, or wouldn't the casting have made more sense with Robson as the detective and Jason Watkins as the stalker? Tony Hill can't be the bad guy!," posted someone else.
Top Channel 5 dramas
Channel 5 has become a hub for gripping drama, these are some of the best My5 has to offer.
All Creatures Great and Small - Based on the best-selling novels by real-life vet Alf Wright, the show revolves around a trio of vets working in the Yorkshire Dales in the late 1930s. Eccentric Siegfried Farnon (Samuel West) hires James Herriot (Nicholas Ralph) for his veterinary practice at Skeldale House alongside himself and his younger brother Tristan (Callum Woodhouse). There James settles into his new life and even finds love with local farmer's daughter Helen (Rachel Shenton).
The Ex-Wife- New parents Tasha (Céline Buckens) and Jack (Tom Misson) seem to have the perfect life, but the constant presence of Jack's overly friendly but suspicious ex-wife Jen (Janet Montgomery) puts pressure on the couple. But as the series progresses it becomes less clear who the bad guy really is and how far everyone will go to get the life they think they deserve.
Heat - EastEnders alum Danny Dyer leads this four-part action thriller, set in Australia, which sees two families holidaying together during bushfire season. But instead of rest and relaxation, secrets and lies start to unravel — and not everyone will make it out alive…
Lie With Me - Another soap legend jets off to Australia, this time its EastEnders alum Charlie Brooks who takes as a married woman trying to saving her marriage by moving halfway around the world after her husband had an affair. However it's far from plain sailing, as a young and attractive live-in nanny comes to work with the Fallmont family, and tensions soon build and eventually, someone ends up dead.
The Drowning - Jill Halfpenny plays Jodie, a woman whose life is shattered following the disappearance of her beloved four-year-old son, Daniel. However, ten years later, the grieving mother thinks she's finally found her missing child, and embarks on a journey to discover the truth about him. But has she really just found the son she has been missing for so long?
And a sixth watcher added: "I can't believe the lovely #RobsonGreen has me watching from behind a cushion."
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Many fans could not believe that Robson Green was cast as the antagonistCredit: Channel 5
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Some viewers think his co-star Jason Watkins should be the villain insteadCredit: Channel 5
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Loose Women star Sunetra Sarker also stars in the hit dramaCredit: Channel 5