Perfect ending for the character. The best part are all his fans mad their edgy mastermind went out like the worm he was.
Despite all the stuff about "I hope Littlefinger sits on the throne!" I don't think any of his fans were actually upset about him dying. And him desperately trying to get out of said situation to no avail is very fitting.
But it's a completely stupid death. Why? Cause it happened for completely stupid reasons.
One of the top two smartest characters in the series, tried to pit Starks, who are known for their family bonds, against each other?
And of course they had to have Bran tell them about Littlefinger, meaning they didn't even figure it out themselves.
Or how about Littlefinger hearing the phrase "chaos is a ladder" from Bran, and not at least acting on it. The dude doesn't believe in magic, but you don't need to in order for alarm bells to go off.
The entire thing is some of the worst game of thrones has to offer, and saying "lol salt" is a lame defense from those who don't give a fuck about writing.
