I find them a bit annoying, particularly TLDR bot, as it sometimes butchers articles by leaving out key information, so much so that it nearly borders on misinformation (eg, in an article about a SE Asian country voting on gay marriage, it cut out all portions about the vote, suggesting that it was legalized when it hadn’t been voted on yet or passed.)
Unfortunately, it gets highly upvoted, so many people skip the article and think that this country now has legalized gay marriage when it actually has not.