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One thing a lot of folks don't seem to realize about him is, his Blast Off ability does damage where it takes off and where it lands... so, if you see an Occulus floating towards you be careful!
Also Occ is a money hog... the typical Vlemish/Plenor combo just ain't enough to spam his abilities so you really need to save up for a Hungarlings Crown or Magus Rod to really make him worthwhile IMO. So keep in mind that he may seem overly effective to you because you're going up against guys who aren't really helping their team out with citadel upgrades as much.
Sounds like you're a beginner and a well played Occ is a noob killin machine for sure so just realize that with a Blood Of THe Fallen Occ you are rarely out of range of some serious hurt because of Chain Lightnings potential range and Blast Off's chasing ability... with a Cloak Of Night Occ its far scarier cause he can blink on you then Blast Off. A good Occ player won't even bother with auto attacking you after you start running... he'll just keep pace with you to do another double jump.
First of all as a beginner you need to play one of the three best Demigods: Unclean Beast, Erebus, or Oak. These three don't really have any weaknesses while demigods like Occulus, though very effective in certain situations, do. Second of all, play one of the best three Demigods till you get better... these are Unclean Beast, Erebus, and Oak. Playing one of these three Demigods will make the game a lot more enjoyable for you as you learn the ropes... and your teamates! Third of all, try playing one of the three best...