It's Sherlock Holmes so I'm duty bound to not give a 1/5 for any story. 
 However, I was fairly disappointed with many of these. They either repeated major elements or just were beyond my ability to suspend belief. They are all so charming though, it's impossible to hate any of them. 2/5 would be just a rolling of the eyes reaction. 
 - A Scandal in Bohemia 5/5 
 This one has it all and just has a classic feel. 
 - The Red-Headed League 5/5 
 I love the set up although it was obvious what was going on. Doesn't he say the more elaborate the crime, the easier it is to detect the motivation in another of these later stories? Well that's the case here. 
 - A Case of Identity 2/5 
 Fairly nonsensical. How stupid would she have to be? How insane must the step-father be to think it would work? 
 - The Boscombe Valley Mystery 4/5 
 Good tale but he solves it really suddenly. I like how he counters all the lawyer's case against the son. Feels like it could've been a novel such as the Australian time could be a good prologue. 
 - The Five Orange Pips 2/5 
 Sign of Four retread but the set up is ok. There is no description of how they pull off the murders. I also don't get why there was a gap in time between murders. 
 - The Man with the Twisted Lip 5/5 
 This one is pure Hitchcock. Surely he loved this one. Great set up and unexpected ending. 
 - The Blue Carbuncle 3/5 
 The hat deductions at the start are just like the ones from Watson's watch in The Sigh of Four. Otherwise it is ok. 
 - The Speckled Band 5/5 
 Great story and I like how you can see some glimmerings of Hound of the Baskervilles in it. 
 - The Engineer's Thumb 2/5 
 This made little or no sense. They suddenly don't kill people? 
 - The Noble Bachelor 2/5 
 Scandal in Bohemia retread and not much else. I do like the US and British under one flag reference though. 
 - The Beryl Coronet 2/5 
 Why would the son not say anything if he could clear it up? I mean British jail time would probably make you get over your feelings being hurt pretty quickly especially if you were a spoiled brat and the cousin disappearance would have to be explained at some point, right? Maybe more ridiculous is the cousin writing the letter to the father telling him some other reason that she left, assuming the guy in jail will not say anything ever. 
 - The Copper Beeches 3/5 
 Cool set up but just falls apart at the end. Another one with Baskervilles style stuff in it.