Venom is not nearly as quick, as agile, or as fast as Spiderman, and his "spider sense" is not nearly as effective as Spiderman's. Venom takes much longer to react to his "spider sense" considering his reflexes are NOT on par with Spiderman's. That being said, again, Venom cannot necessarily defeat Juggernaut because a comic book published it - Lobo was defeated by Wolverine in **one** comic book also, but is that cannon? No, it is not. Lobo would mop the floor with Wolvie.
Let's get real, here - it was a mini-series FOR Venom. In any other published comic book, Juggernaut would STOMP Venom. Venom, at best, could POSSIBLY incapacitate Juggernaut - he could never defeat him.
Juggernaut's forcefield does not work when he is only running - recall that he is virtually unstoppable when moving forward? Why would he need a forcefield to work only when he is running? Redundant, right?
And Venom has the best shot at defeating Hulk? LMAO, which one? Grey Hulk? Never. The Professor? Never. Mindless Hulk? Never. Recall it took the ENTIRE Avengers (the line-up at the time was Thor, Scarlet Witch, Vision, Human Torch, Starfox, Dr. Strange - and Spiderman, Iron Fist, and Powerman all chipped in to help. Hulk WALKED through all of them) to dispel Hulk (Dr. Strange)? How many Avengers do you think it would take to neutralize Venom? Let's see, who could do it by themselves? Thor, Iron Man, Vision, Scarlet Witch, Goliath, Wonder Man, Moondragon, Thing, Submariner, Hercules - get the picture? Black Panther would probably gut Venom.
Venom, defeat Hulk? Er...no. You need names such as Thor (on his BEST day he MIGHT stalemate Hulk), Superman, Juggernaut.