Originally Posted by Asmodeuss1990
Nocturne is crazy fun and really good too. Strong ganker/jungler/melee dps/assassin. He's paper thin though so you gotta learn when to ulti in to commit and when to just back off. Irelia is pretty much an unkillable offtank late game with a means of healing up to full health. I'd definitely get either of these two. DO NOT BUY CASS! She is the biggest waste of IP you could EVER spend. Terrible design and crappy damage, her squishyness is disgusting. She sucks and will suck for a very long time. So its obvious, take your pick.
Nocturne = Melee dps/assassin
Irelia = Strong offtanky dps
She is squishy and has some problems, but to say Cassiopeia deals crappy damage is simply wrong. She has probably the highest potential single target damage for a caster in the game. The main problem is that she is really hard to do well with because you have to be really good at positioning yourself, knowing when to take risks, hitting skillshots, and you have to have a team that can support you well (i.e. has enough cc to keep you safe and let you do your damage.)
I like Cassiopeia, and she's fun and can be effective, but she's not someone I would really recommend to most players. You pretty much have to want to play her to get good, she's not someone like Ashe whom you can use from time to time to good effect without much practice.