Twitter is the most awesome, amazing source of news and updates I've found. For example because I follow Tavis Ormandy on Twitter I know that a vulnerability related to bittorrent will soon be released by Google's Project Zero.
That said, it took months to get my feed to where it is today. It's not easy for each person to find the mix of accounts that is best for them. My recommendation is, be fast to follow folks who look interesting, and fast to unfollow folks if they are boring or you don't like them. When you find folks you like, see who they retweet, reply to, follow, etc. and follow all those folks to see what you think.
are there services out there which curate the channels available to insure quality and content? Say if I wanted to follow a particular sport or team, are there services which can set it up? Same goes for any subject
That would be very subjective. But probably exists.
I am a heavy user of Twitter's List feature, and have columns in Tweetdeck for friends, local, sports, politics, colleagues etc. And try to curate these for my interest as best as possible, ie weed out too noisy tweeters etc.
I guess you can find other people's lists and follow them? E.g. a sports journalist's sports lists etc. I have not tried to do that so not sure if there are hurdles to overcome. And maybe someone can aggregate these public lists for others to find/follow?
ESPN only really cover one country. If you're in the US I'm sure it's fine but for everyone else the coverage is not only almost nonexistent but often factually wrong when it does exist. I saw AFL coverage on ESPN where they did not understand the distinction between goals and points and left the wrong scores up for ages.
That said, it took months to get my feed to where it is today. It's not easy for each person to find the mix of accounts that is best for them. My recommendation is, be fast to follow folks who look interesting, and fast to unfollow folks if they are boring or you don't like them. When you find folks you like, see who they retweet, reply to, follow, etc. and follow all those folks to see what you think.