You will notice with time that Warwick is not even a good jungler anymore because his clearing speed is too low and many ganking junglers (a ganking jungler is defined by making a lot of ganks instead of fighting the enemy jungler or trying to farm in the jungle most of the time) can attack the lanes with level 2 or 4 while Warwick has to wait for his ultimate and by this time most lanes (in matches against more experienced players) are at least partially warded and Warwick is not the best choice for tower dive ganks compared to Rammus, Nautilus etc.. If you have fun playing him, he is better suited for the top lane.
You will also notice that jungling becomes a lot more interesting if you have to deal with counterjungling. Clearing the camps is never an issue for a good jungler, but dealing with another player and successful ganking against wary players at the lanes puts jungling on another level of competition than you have right know, therefore practice as much as possible to learn all the basics before you have to overcome problems like this.
The problem with jungling in low level matches is usually that you need somebody to hold the top lane in a 1v2 situation and you cannot always count on having an experienced player at your disposal who can take the heat, therefore it's better to ask in the champion selection to ensure that somebody is willing to do that.