I've had decent success with this deck on both DuelingBook as well as real life. This deck has pissed people off in duelingbook. Even earlier today I had a duel where I drew two Fusilier dragons, two Metamorphosis cards and Tyrant Dragon. Summoned King Dragun on the first time, special summoned Tyrant Dragon then drew Blue Eyes my second turn. Opponent accused me of cheating and raged quit. You know it's a good deck when it has that effect. 

Another guy got pissed a different duel since I got my Horus LV6 out quick (thanks to King Dragun) and got LV 8 out. 

In real life at my local card shop, played a few duels with it (not a huge goat scene. Really just four of us). Everyone has been impressed that I made a Kaiba/dragon deck that breaks the typical Thousand-Eyes meta and is competitive. Is it full proof? No. Is it good? Yes. 

Another way I like to play it, is I take out the three Blue-eyes and the three Kaibamen. Instead I play the 3 Thunder Dragons, Polymerization, Sangan and usually Tri-Horned and use the Thunder Dragons with Tribe-Infecting/ to bring out Twin-headed and Sangan for Cyber-Stein. Won a couple of duels in real life this way. 

Weakness is though you can get a bricked hand and not able to summon any monsters. Our just shear like the only two monsters I draw are Tribe and Breaker which can stall some time. Other times you get good monsters but I just can't seem to draw any of my back field counters and I get hurt by a Gravity Bind/Injection Fairy Lily combo (happened the other day... twice).

Overall, I love the deck. It's fun to play and it's different then the typical chaos/Thousand-eyes decks that have come to dominate Goat. Also there is just a cool factor satisfaction when you can get Blue-Eyes on the field quickly. It makes me feel like it's circa 2002 and I'm 10 again! I get a huge smile on my face every time!

My Main Deck King Dragun/Kaibaman Turbo