I played a campaign as Prussia and by 1735 Maratha had not only conquered India, Persia and Afganistan, but had taken Antigua from the Pirates. By 1740 they actually sailed through the Baltic to land in Courland, destroying them on the turn after they landed. This actually worked out because it gave me an excuse to take Courland without going to war with my immediate neighbors as I built up my defense, but by 1750 any historical realism was long gone.