Pretty much what others have already said above.. music and camera angles.
I personally detest music on mtb videos. So much so that when I added a drone to my armory (which means zero audio) I had to pick up a lav mic and audio recorder just to start recording ambient audio/other crap so the drone bits arent silent. Aside from my first video using drone footage, I simply refuse to just overlay music. =)
I'd make some exception for very subtle, low volume background music, but even that can be annoying if not done right. I guess I'm just more a fan of the sound of the tires meeting the ground.
As for the angles, my gripe is more with the angle of the camera used (vs. the also-very-valid point of getting other angles off body, or mounted elsewhere like on the bike, helmet, facing back, etc.) I have a hard time with it myself, but that chest cam needs to point up more. While the lower angle helps show the terrain and speed a bit, the whole frame ends up as just a blur of handlebars.
Oh, and yeah, duration... I have a friend who launched a 4x4 overlanding type channel. His videos all start with the intro clip. In his case I think theyre even longer than yours, and even at a minute, I consider that way too much. If you're only catering to the one-off traffic (ie, people who have never seen the channel before and NEED some kind of intro) then there's some argument for more up front, but in general, keep it short. I don't even bother with one, but if I did, it'd be 15 seconds max.
When you build up an audience who has already seen your videos, the last thing they want is to waste another minute watching an intro they've already seen many times before.
FWIW, a slightly less annoying method that seems to be happening both on youtube and on broadcast TV that I've noticed would be shows/episodes starting out with the actual show right off the bat, then at some sort of interesting point early on, cutting to the 'intro' bit, then back to the show. Intro credits don't run on the show Archer til a few minutes into the episode, for example. This method lets ya force that thing down your viewers throats without loosing them at the very start. And if done right, those first few minutes of content hook them so they suffer through the intro for some closure to see the rest of the episode.
Disclaimer: I'm quite shitty at the actual production of mtb video stuff. Still just learning. The above stuff is just what i know i prefer to see when watching stuff.
