I don't like the second sentence.
I would say, "it's a really good way to spend an evening."
Here "it" means "playing video games".
It's the same saying, "Playing video games is a good way to spend an evening."
Just my opinion...I'm not a grammar Nazi by all means.
※ 引述《pavlov (海風)》之銘言：
: 英文書給的答案上寫:
: My friends and I are really keen on playing computer games.
: They are a really good way to spend an evening.
: 單複數在文法上不是應該要一致嗎?
: 還是這是某種例外?a really good way其實當作不可數的片語?
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