horrible order execution and many requotes... impossible for scalpers
Same goes here. Try cTrader - no requotes are possible there (due to proper market execution). I have scalping bot on cTrader with different brokers, works as a charm.
Quite few times I had even PRICE IMPROVEMENTS on Limits, that were passed onto me (executed price better than limit price), unheard practice in MT4 world. Now thats what I call a platform.
Long story short - just use cTrader.