What does everyone have against Rome?

[The General]

I dislike them because they were only lucky,nothing more.

Not true.

Luck did play a part, but the Romans didn't just "get lucky".

And noone likes those who conquared the world.

More likely.

I personally, for example, tend to side with the smaller states/losing empires (the Celts, Byzantines, or for example, Finland in the Winter War [nationalistic feeling aside]).