Even though I do it in my tutorials out of concentration, I would say avoid the dreaded " ummmmmmmmm"
Also, a nice camera never hurt anyway lol, I'd rather see all of you than one pixel
Furthermore, editing of a vlog should be up to the user to decide on a style, I really have no for better or for worse opinion of the jump-cut technique, but that is totally up to the user. Scripts are definitely optional, I'd say if you have trouble organizing your thoughts, maybe a few note cards would help you, but if your naturally great on the camera, and you can get to the point of your vlog, then all the power to ya.
For shorter vlogs, I really like to see people get to the "meat" of their vlog early. For example, if your vlogging about Obama, you should be talking about Obama within the first 30 seconds, talking like all this nonsense, and then 5 minutes in you say " yea, so anyway I wanted to talk about Obama" I'm sorry but that doesn't fly for me
Also, I love to see strong sided vloggers, I don't like when people are like, I kinda like the color pink... sometimes.... depending.... maybe if you like it...
I'm just saying, not everyone in this world is going to agree with you, you will have haters, and they won't just be from youtube either, you just have to take your position, ffs just say " NO I HATE PINK!" and then explain why.
I can't stand vlogs talking about controversial topics and there like... but I don't want to offend anyone.... I think that if your opinion is going to offend someone, then oh well, they will get over it.
Dynamic changes in voice is great to listen to such as getting louder and quiet. People often say don't speak too low, but you never really see the opposite occur, such as ... bro, stop shouting...
These are my ideas for what I would like to see in Vlogs! And yes this is my opinion so don't get offended