Maybe someone already analyzed all 700 altcoins and can write quick overview?
Why all 700? All altcoins are out of top 100 are worthless to analyze because most of them are abandoned projects, or scam project, or projects developed by incompetent devs. Top 40 may need some analysis for investment, top 40-100 still some scam coin, or bad projects.
You can even find some borderline scam projects/coins with very questionable past in the top 10 altcoins with highest marketcap
Unfortunately sometimes altcoin supporters choose to fuel money into bad/scam projects and recover some of their loses than abandon it and lost everything as a result.