Without spoiling much, the sense of tension and danger dramatically increases once the group gets to Egypt. The plot structure, whilst formulaic, is also pretty understandable when considering most of DIO's subordinates are selfish people purely working for money or out of fear that wouldn't really attack as a group (other than Hol Horse and J. Geil) when considering how well they'd work together would purely depend on their synergy in Stand abilities, not to mention the factor of mystery and surprise in which avoiding obvious team ups would be necessary.