I disagree. I've played with it on the PBE, so let me correct you on a few points.
Push wave making it harder/riskier to cs.
You're not getting this item in lane. The stats don't allow it. It's for pushing lanes and taking towers. There is a point of the game where the laning phasae ends you need to take towers. This item helps do that.
The voidlings will take your cs, overall decreasing the amount of gold that can be earned in the lane it was deployed.
Two things. First, you get gold for whatever they last hit. Second, you can leave the lane after placing it, meaning you can actually be farming a lane you're nowhere near. Seems good to me.
I assume gold can be generated from killing these things which result in MORE GOLD FOR THE ENEMY.
You assume wrong. They don't.
Finding the enemy Zz'Rot will become a chore if you do decide to pass up on free gold.
Finding it is not particularly hard. Again though, the minions don't give gold.
It's a trap for newbs who think they can influence a lane with it.
You don't buy this item to influence a lane. You buy it to push towers. It is very, very good at pushing towers.
Reminds us of Dota. Please don't.
One of the biggest advantages Dota has over League is strong item actives. Some of the best gameplay in League's recent history has come from increasing item actives (more active items may be the single best thing that has ever happen to supports). I see nothing but positives here.