I guess it's not only me, but Lina doesn't feel good at all right now.
Despite her Q and W are multi target, at the end of the day you using them on a single target only, her E is probably her best ability, and her ulti does too little, late game you can't take away 50% hp from a support.
To land a stun you have to waste Eul and do a difficult combo when others can do the same sipping water, and you have Eul on CD instead of protecting yourself with it.
Compared to skywrath or lion, they both start single target to end multi target through talents and Agh, Lina? Why can't she too?
IMO there should be changes like
-Q is 2 times larger
-W has a larger area and/or less delay so you don't need Eul
-E should grant damage or become an aura for allies too
-R needs a damage buff or CD and mana reduction
All this can go straight away or through talents/agh. I don't think they wuold make her OP, just more enjoyable to play and having an impact because now I cannot feel that, she's boring and weak