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Sn2, Ep1 – A Scandal in Belgravia.
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Sn1, Ep3 – The Great Game
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Sn2, Ep3 – The Reichenbach Fall
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Sn1, Ep1 – A Study in Pink
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Sn4, Ep3 – The Final Problem
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Sn3, Ep1 – The Empty Hearse
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Sn3, Ep2 – The Sign of Three
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Sn1, Ep2 – The Blind Banker
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Sn4, Ep2 – The Lying Detective
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The Abominable Bride
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Sn3, Ep3 – His Last Vow
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Sn2, Ep2 – The Hounds of Baskerville
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Sn4, Ep1 – The Six Thatchers
The Not Left Handed Either Film Guide 
A lot of people seemed to not like The Six Thatchers for some reason. For me, The Blind Banker was the worst.
To be honest I have enjoyed them all. I know a number of people who hated the final episode of this most recent series but they all have great moments even if they don’t all hold together perfectly.
Yes, I’m a big supporter of this series 4 and loved all the episodes in it. So I too don’t get the hate that this series seems to be getting.