What's really missing here is a discussion about DMing different groups through pre-fab adventures. Sometimes those adventures simply aren't tailored to the group in question. I reject the notion that strikers are the best classes in the game. they are the best damage dealers certainly.
How are the group's resources being managed? Are they being placed in situations where they are unable to take extended rests at will? How do your encounters stack on each other? Do you have any encounters specifically designed to challenge the PCs and eat healing surges? Are there wandering monsters in your adventures? All of these questions are important.
A party with a defender, leader, controller and 2 strikers can weather many different types of encounters better than a party with 5 strikers.
How are the group's resources being managed? Are they being placed in situations where they are unable to take extended rests at will? How do your encounters stack on each other? Do you have any encounters specifically designed to challenge the PCs and eat healing surges? Are there wandering monsters in your adventures? All of these questions are important.
A party with a defender, leader, controller and 2 strikers can weather many different types of encounters better than a party with 5 strikers.