You wanna know why I dislike their videos so much? Why not give this a CinemaSins-style appraisal, see if you see my logic? An appraisal of both on-topic matters and then also things in general. Alright, go:

STRIKE ONE: Gmod GRAVITY FALLS Prophunt! - Mystery Shack Map (Garry's Mod)
https://www.youtube.com/watch?v=GjyrF8KH4fI

[-:--] The first point, probably worth mentioning, is that they posted this video right after a content patch, which led to some missing textures present as they were not on the current version of the map at the time. Also means that they did not pay heed to the prerequisite of needing Counter-Strike: Source.

[0:23] The fact that Venturian is barely even aware of the channel that the show airs on and what the names of the main characters are says a lot about him being here on this map.

[0:50] If Venturian was more aware of what the show was about, he would realize that the "room full of dead things and aliens and G-Man" is the museum area. It's not that hard to connect.

[2:08] Inane talk about being turned into a cookie. Barely an entertaining humor point.

[2:20] The sounds coming from ImmortalKyodai's mouth.

[2:39] A tick for all the random Illuminati comments made towards the Bill Cipher symbolism. I mean, you could say Bill is an illuminati symbol himself, but that's not the whole of his freakin' character.

[2:43] Very basic joke made in the episode Boss Mabel that is one of the more popular memes of the show.

[2:57] Venturian barely even knows the Half-Life 2 resources, not recognizing the Combine Turret or Shield Scanner. Not all that related, but noteworthy.

[3:08] Why would you immediately affiliate a floor stage to being Obama for a day? Not even a poke about music concerts or anything, just 'Obama for a day.' What?

[3:17] Pictures of the site of the great war of the waffles. What the fudge, man? Those are literally just pictures of Italy from Counter-Strike: Source.

[3:29] What is it with this guy and waffle wars?

[3:35] Proof he did not pay heed to the CS:S prerequisite.

[4:18] More inability to recognize HL2 assets, that is the Cremator Case from Black Mesa East.

[4:37] The sounds coming from ImmortalKyodai's mouth.

[5:18] "Perfect hiding place", while he sits oblivious next to a more perfect hiding place that he can very clearly see.

[9:23] Maybe a bit of a benign thing to point out, but I'm going to anyways. That chair is there via the episode Double Dipper, in the scene where Dipper talks to Wendy outside the bathroom.

[10:29] Venturian regards Journal 3 as if it were nothing more than the third book of the Harry Potter series, as a generic concept. It's one of the main focal points of the show, so if you don't even know what that is, that's just sad.

[-:--] And then there's the point where I first politely asked them to not return to the map in a comment, which not many believed was legit.

STRIKE ONE SIN TOTAL: 17

STRIKE TWO: Gmod Roleplaying in the MYSTERY SHACK! (Garry's Mod)
https://www.youtube.com/watch?v=tKJlU7bk0Nc

[0:00] This guy's face and the way he talks already looks like a turn-off, here.

[2:40] More Illuminati jokes.

[3:37] The missing material on the chairs, more evidence of lack of CS:S.

[4:49] This humor point is stupid, because the first time he looked, Bethany was directly behind him, and the second time he looked, he was not at an angle where he could see her reflection.

[6:03] I'm just going to mark down that this guy freakin' slings out his physgun and takes the mirror. Put the damn physgun away, man.

[9:13] This entire part of the video is completely idiotic. I totally find a guy pretending he thinks a trash can is a toilet 5 feet from the actual toilet hilarious. Can you see me laughing? No? That's because I'm not.

STRIKE TWO SIN TOTAL: 6

STRIKE . . . TWO-POINT FIVE?: Gmod GRAVITY FALLS DIPPER Mod! (Garry's Mod)

[1:20] He read the comment asking for another video at the map, but not my previous comment asking him to not return.

[2:37] Their entire portrayal of Dipper here is completely wrong, and I'm going to mark it down.

[7:53] Venturian saw that passage back in the first time he visited, but was completely oblivious as earlier mentioned.

[8:14] So many people for some reason have trouble grasping how this lift works, and that's worth a sinnin'.

[9:06] Illuminati jokes. Are they funny yet?

[12:25] Actual knowledge of the show would tell you what that skin of the model actually represents.

[15:58] Actual knowledge of the show would also tell you what that device is.

[16:52] It's moments like this that make it apparent that these guys barely actually know anything about the show. They don't really have a right to be here.

[-:--] And here is the point where I gave my second and final warning politely asking them to not return to the map. Again, I was met with dubious responses of people not believing I was the map creator.

STRIKE TWO-POINT FIVE SIN TOTAL: 9

STRIKE THREE: Gmod GRAVITY FALLS DIPPER Mod 2! (Garry's Mod)
https://www.youtube.com/watch?v=EZTGAhgv-zs

[-:--] First point right away is that right here is the video that ignored my final warning. Guhh. Idiots.

[1:45] The character's name is Mabel, not Maple, and basic knowledge of the show would tell you that. Don't even have to watch more than a single episode to know that. You could even just read the episode synopsis that TV boxes give you.

...that video only had two sin points, but the first one was pretty big. And the fact that the comments section became more quickly torn up about this issue before VenturianTale themselves says something.

STRIKE THREE SIN TOTAL: 2

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And there is my appraisal of why they're so bad, and badder than anyone else's amount of bad. You can agree with it. You can disagree with it. Either way, that's my stance, and that's why I never want them to come here again. And every CinemaSins-style appraisal ends with a Sentence, doesn't it? Well then, here it is;

SIN TOTAL: 34