I agree with you on the broken English flooding the forum, but Mt. Gox certainly did affect the bitcoin price. By a whole lot actually.
din't compare Mt. Gox with current exchangers, that was a totally different story in a different day and age. by that time there were not this many exchangers to use for bitcoin exchange, so it was a big ass exchanger that had most of the volume so scamming meant a lot of people getting affected.
2. bittrex, poloniex and c-cex are mostly altcoin exchanger and despite the fact that they have btc-fiat pair they are not affecting the market that much (low volume)
Yobit: who cares about them, they are already shady.