1)Bad graphics
No real bad, i like some graphic in lineage.
2)Unbalanced classes(Dwarfs and Kamaels are useless,Elfs and Dark Elfs are not so strong as Human and Orcs).
The class are balanced you just need your skill and your experience ^^
3)Latest updates are totally useless.(From T1 to Gracia Epilogue,we saw nothing interesting)
Try play in a official server you will see a big difference than private server.
4)The gameplay remains still boring(Kill monsters to get adenas,kill to get weapons,kill to gain levels,kill...all the time)
Yeh the gameplay is boring but lineage and Aion = train the farmer.
But lineage have quest and castle siege.
Look wow is the same quest quest quest...... and kill killl killl......
Lineage and wow dont have a real difference for the gameplay
5)Lag problems
I make a private server with 1mo/s download and 256ko/s upload, i have 25 players connect online with no lag.
If you have a good internet and dont have far player than you dont have lag.
You need more upload the download is not very important but you need tooo ^^