These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Republic Of Doyle
Awesome Music: This show has it in spades, from the theme song (Great Big Sea's "Oh, Yeah") to the songs used in the episodes.
Bald of Evil: Big Charlie the biker, although he's got short hair again as of season five.
Cargo Ship: Slightly in the case of Jake and his car.
Now, er, sunk, due to it being blown up in the season three finale.
Perhaps not since Des has been able to covertly secure the remains of Jake's GTO in order to have them repaired to working condition.
Malachy has it restored to perfection by the time Jake returns in season five.
Come for the X, Stay for the Y: Come for the rare portrayal of Newfoundlanders as something other than toothless idiots, and stay for the surprisingly good writing and character dynamics.
Ear Worm: The theme song. You might find yourself singing "Oh yeah-ee-yeah-ee-yeah-ee-yeah" for a while after you've seen a few episodes.
Rescued from the Scrappy Heap: Tinny. As mentioned below, she was a right little arse in the beginning, but once she started training to become a cop, she became a lot more mature and responsible.
The Scrappy: Tinny (to some - also qualified initially as the load). Has grown/dealt marijuana (which could have landed Jake/Malachy in serious trouble if she'd been caught), is a completely manipulative witch to Mal, Rose and Jake in the beginning (who are all honestly trying to help), blatantly uses Des, finally gets a chance to go to England and seems to have just thrown it away, etc.
Subverted a bit in that she actually did go to England, she just couldn't crack it and came back.
Des as well. He can come across as a bit creepy (he absolutely worships Jake and even wore his pants for a while), and his habit of inappropriate babbling (while other characters look on uncomfortably) can be grating to some.
Sloan. She's been getting a lot of hate from fans lately who feel she's taking over the show. She came out of nowhere, was revealed to be Jake's daughter, is gorgeous, smart, sarcastic... One reviewer commented that the show seemed to be becoming "Republic of Sloan". There are also complaints that she seems to be the Replacement Scrappy to Tinny, as she shares a lot of similarities to Tinny in the early seasons.
Special Effects Failure: A couple of times in season five in particular, the usage of a green screen during some stunts is very obvious, and pay close attention to when Jake is talking on his iPhone - you can tell it's on the home screen or actually locked (you can see the white "slide to unlock" bar, if it were in call mode, there would be a red "hang up/end call" button instead).
Squick: Jake's reaction whenever Malachy and Rose start to get intimate.
Leslie breaking down after she ends things with Callum.
Jake and Rose racing to get Malachy (who's been shot) to the hospital. Even the weather is grim and dismal. The moment after Malachy gasps that he loves Rose (and always will) is just heartbreaking. Rose looks absolutely terrified and begs Jake to hurry. Thank God Malachy got better.
The end of season five has the entire Doyle family broke thanks to Sloan robbing them, and Jake digging possibly dead Leslie out of a grave, and subsequently arrested for killing one of her exes. All while "Say Something" one of the most heartbreaking songs of the year, plays in the background.