Visage is a good early game counter to magic burst - it seems like he was having problems against Kassadin - visage would help. But sure, visage has no place in a 5 item build.
You hardly seem to notice in normal games because you care less about normal games. It's impossible to avoid dcs, people can have bad connections - thats unavoidable. Everything else on the list is unavoidable too, but it happens less in higher elo, mostly because the people who are likely to troll/grief, afk on purpose, rage quit etc drag their elo down. Yes, its sad that you have so many disconnects, but we know low elo sucks - you should drag yourself out, if you can.
