Interesting, I too have considered deleting the account few times.
In my opinion, the endorsement feature is totally useless and doesn't represent any real value.
The only thing useful in LinkedIn case is that sometime I want to connect to a person, and upon looking at their LinkedIn I can find that they are connected to someone in my network.
I've thought about deleting as well, but then I realised that it can't hurt to just have it sitting there so people can connect if they feel the need.
I update mine every so often, never reply to any recruiters and connect with a few colleagues I know who use it religiously. Best way to use it in my opinion.
I got my previous job by a recruiter finding me on LinkedIn, who actually matched my profile to the job.
My most recent interview, the first thing the interviewing manager asked was to connect via LinkeIn.
They also make poor use of notifications. My "friend requests" always shows 1 new notification- but it's a fake notification trying to get you to send out invites. I find user-hostile actions like that very off-putting.
Considering deleting the account, but I'm curious if just "having a profile/presence" on the service is useful or desired by employers? Not sure if I'm "losing out" on anything by not having an account.
The one thing I do like is that others you've worked with can "endorse" you for certain skills, but in reality I'm not sure how useful that is, ultimately.