Mr & Mrs Smith was a favourite of mine as a teenager, but it's been many years since I last saw it. Luckily, it held up surprisingly well. The action remains extremely well choreographed, the humour still largely lands, and any hints of misogyny are entirely absent.
You have to ignore the magic body armour and obscene gun magazines, which only run out when it fits the action beats themselves; also, the concept of a married couple secretly working for two separate illegal spy rings is farcical. But, if you can look past the ridiculous setup, it's a great piece of fun with two excellent actors that bring solid performances to the mix.
Sure, there are some plot holes, but you like the characters, end up wanting them to succeed, and get a decent pay off from it in the end. It's a film that knows what it is and has fun with a competent execution. I can't be too mad at that.