According to a 2013 study, the CTR’s for the first page goes as:
TOP 1: 32.5%
TOP 2: 17.6%
TOP 3: 11.4%
TOP 4: 8.1%
TOP 5: 6.1%
TOP 6: 4.4%
TOP 7: 3.5%
TOP 8: 3.1%
TOP 9: 2.6%
TOP 10: 2.4%
So when TOP 2 and TOP 5 shows the same page - I just loss my traffic for other pages.
What is why the @vinothkannans answer about canonical is not a solution.
And excluding tag pages from SERP would be crazy at all: a huge traffic loss.