I kinda dont like being the first person to be really critical. Ill just let you work on the presumption that the stuff im not mentioning i consider to be fine, rather than having to justify criticism using praise
I will say though that your making one defense a 'go-to' isnt a bad thing, as long as *you* selected it.
2:00-2:05, the sucker punch one.
1: He was WAY too far away. You could have just leaned back slightly and it would have been fine.
2: He telegraphed excessively. It tends to happen when you tell people to throw a haymaker the way they see other martial artists who are told to throw a haymaker throw one. The arm isnt pulled back, so much as it goes back to follow a circular motion. Try just throwing a big wide hook starting from your hips, and watch in the mirror. Your arm goes back. Thats basically a haymaker.
3: You were prepared for it. The second he moved you twitched into your predefined motion. BEFORE he even started punching. He stopped walking, you started blocking. Watch it slowly. Thats not bad if you do that for real, but for real, youre not gonna know what hes doing, he wont be the only person in the area, you wont be expecting the punch, and chances are by the time you work out what youre supposed to do, itll be a bit late for that.
4: He just stops completely after the first punch. No momentum, no following strikes, no shoving, grabbing, nothing. Its a very limited exericse.
5: He started falling slightly before you threw him. Thats just a training leftover, but still. He wasnt 'trying' to keep attacking.
2:06-2:13, the grab one.
1: People dont grab you like that just to stand around doing nothing. Its a push, a pull, a shove, a headbutt, a knee, a grab and punch, or a grab-stand-right-up-close-and-yell-in-your-face.2
2: Same thing. He doesnt even try to stop you. But thats okay. Its just that by these standards, he grabbed your shoulder, so you threw him on his back, beat his head in, and smacked his arm up.
2:13-2:20, the knife one.
Okay, basically, im just going to be very nice and say that he was nowhere near close enough to stab you, he wasnt trying to cover the distance, he froze the second you started your counter, he didnt even attempt to stab you again, he didnt use his free arm for anything, and he basically just let you set up your... defense. Other than that, this hurt my poor delicate eyes slightly less than some of the other... stuff you can find around.
2:20-2:28, the gun one.
1: Guy brings a gun means hes risking imprisonment for using a deadly weapon, let alone whatever he wants off of you. Shooting you the second you do anything twitchy is much safer for him than risking being imprisoned for attempted murder if he does nothing. Youre counting on him not wanting to shoot you.
2: Again, hes just standing there. I second the suggestion to get a training weapon.
2:28-2:35, the club one.
1: He isnt even trying. Hes slowly straight-arming the thing out of range at your head, stopping before you even do your defense before your head, then waiting while you do your defense.
In the name of being helpful; (counting 1-5 for each one)
1: Get him to sucker punch you as if he actually wanted to hit you. Thats all, really. You dont typically walk past someone then try to hit them straight on. Think about it. Closer, less telegraphed. Thats it!
2: Actually make the grab serve a purpose other than giving you something to wrap your arm around. You know, whatever HES using it for. Thats it!
3: Yeah, do whatever you want mate.
4: Its not really a situation thats easy to defend against. Try being the attacker, and emulate 'shooting' the second you freak out because the other person moves. I guarantee, youll do it before his defense every time.
5: Same as the knife.