Some cinematography lessons could be in order. When a clip starts out already at 50% speed (or whatever you had it at), I almost immediately lose interest. It's much more exciting to start the lead-up at normal speed and then do a camera cut while changing to 50% or less speed...it's like bullet time or something. This is especially apparent in your third clip; I don't want to watch your guy push in slow-mo for 10 seconds before any tricks happen. Immediately after you land, ramp it back up to normal speed, possibly with another camera cut to lead us out.
Second, this is a video game. While those might be cool clips in real life, they are just not cool enough for a video game (sorry). More tricks are in order. In your first one, you just ollied a big gap, rode up a half-pipe, and did a pretty interesting flip, but we couldn't even see you land.
The second clip really wasn't bad, but see my first paragraph about speed and such.
The third clip is not really interesting at all. You did a kickflip over a dumpster and did a 50-50 to a 5-0 grind before ollie-ing off the rail. Again, cool in real life but not in a video game. Protip: boardslides make great videos.
You're at least starting, and utilizing the replay editor fairly well. Keep changing ideas up and you'll be fine.
