The first was very nice. Same thing as JDawg said
The second was alright until that horrible decap. The decap looked really messy.
The third was slow and weak looking. But I sorta like it. You could've achieved a higher speed if you placed your legs more firmly on the ground. And I saw a big oppurtunity to use the right arm at about frame 1900 to achieve higher speeds.
The fourth I really didn't like. I really don't have a reason why, but I just don't like it.