Do you think more than 1 critical path reflects bad planning?
The PM books say that more than one critical path will increase risk to the project. My answer is NO. It may even reduce the risk.
Imagine a situation where the committed project duration is 20 days, there is a critical path of 20 days and a non critical path of 16 days in the diagram. In the present planning, if any activity on the critical path gets delayed, then my project will go past the committed date.
So I transfer some resources from the non critical path activities to critical path activities (provided technically it is possible), and in that process make 2 critical paths of 18 days each in the network. Still I am reducing the risk to the project as both the network paths have a buffer of 2 days now as my committed duration is 20 days.