Is Bigger Always Better?

I've decided, instead of writing hundreds of words about the theory, i'll just paste here a couple of graphs.

Here is the first one:

Which days of the above week is better? The bigger one is the 4th, that's the best one! (2.4 Million pages)

And how about Unique Browsers (Cookeis)? here we go:

Which days of the above week is better? The bigger one is the 4th (again), that's the best one! (670K Unique Browsers)... But if bigger is better, how about page frequency? 

4/2/10 - pages per Unique = 3.58

2/2/10 - pages per Unique = 10.11

Yes, defenetly bigger is better, but for which metric? it depends on what the websites judges important.