its not cheating at all to use auto leveling, and everybody use it :-)

There are a few different ways to gain expirience points in the game:
1) doing the labyrint - you can do this a couple of times each day (depending on your vip lvlv and if you guild holds a specific city)
2) killing monster
a) during quests in dungeons
b) killing monsters manually
c) auto lvling to avoid the tiresom Work of doing the same batle 100 times
3) Training while being afk (click the training icon)
4) robbing xp-stakes in arena

1 gives the highest xp reward then 2 then 3 and then 4

So a rule of thumb for lvling is to do lab 1 or 2 times, then use the rest of you stamina on autolving, when your stamina reach 0 just go afk and let the traning do the job for you