Modeling

I listed the following comparisons as  my note for classic modeling.

Boolean Model

• Advantages:

1. Allows for logic 
2. Provides all that has been matched

• Disadvantages 

1. Has no particular order of output
2. Treats all retrievals equally from the most to least relevant ones
3. Often requires examination of large output

Vector Model:

• Advantages:

1. Returns ranked retrieval 
2. Terms are weighted by importance
3. Partial matches

• Disadvantages 

1. Assumes terms are independent
2. Weighting is intuitive, but not very formal

My question for vector model is that it's really hard to make sense how 10% relevant to query conveys less meaningful information for resolving queried information problem than a 40% relevant one? Do they have clear difference in terms of fulfilling the query need?