Elise seems under powered to me... or at least unimpressive.
I have gone from 950 ELO to 1060 over the past week. I think what turned things around for me was picking an underused role and really learning it. For me it is support, Sona or Soraka.
I have also tried to make sure I can play any role at least decently, without feeding. I am worst at Jungle but even that I do "okay."
Elise could be at a bit stronger spot, but once you get the hang of her, hoo boy does she give a good look at the potential. A few number tweaks here and there and she'll be golden. Mainly cooldown reduction, since a lot of her skills (Q in spider form, W in both) seem to be a bit lengthy compared to similar champions, and possibly some minor changes to her W in spider form to make the healing worth anything at lower levels if they expect her to jungle.
For human form, she has a good early game poke with her Q (which has a very low base cooldown), a good amount of initial damage and scaling with her W (with some interesting things you can do if the enemy decides that hiding behind creeps is a good thing to do), and a pretty good skillshot 1.5 second stun. Travel time could be a bit faster on that, though.
Spider form Q is a somewhat boring execute, with the inability to leap over walls, though it is funny watching the spiderlings rush at the target like cracked up zerglings after hitting your W. Her E though, dear god is it amazing for running away or acting as a gap closer. Since it turns you invulnerable to further things launched at you (you can still die if you're ignited at low health, though), you can use it to avoid any number of skills, at least until the 2 seconds is up and she goes back down. It's a Fizz Playful/Trickster, with a bit longer cooldown, but better overall. I've spent quite a few games getting chased by half (or all) of an enemy team in spider form, across the entire map, due to this beautiful bastard of a skill.
She is just a high skill cap champion, with a lot of options for what she could be doing at any given time. Her main weaknesses are being squishy even with the bonuses spider form gives, and a lack of slow without items with the movement speed on her ultimate not scaling past 10 and feeling a bit underwhelming after the spotlight advertising it as being her ability to get to lane or jungle faster. Rylais is extremely good on her due to Q in both forms affecting the full slow, I recommend it as a core. The spiderlings feel a bit slow to pop out after hitting R, and her W seems to have a minor lock on it when using Q on targets, but fixing those would just be minor quality of life improvements, akin to what Syndra received in this recent patch. Her gank potential is somewhat low compared to other jungles, because if you lead with spider form you end up likely having to use your gap closer just to catch up, with red buff being a must in most cases, and if you lead in human form then you end up that tiny bit slower and squishier, hoping that creeps aren't surrounding your target so you can E them to stun.
Twisted Treeline remake is out, along with a new AI mode for Twisted Treeline. Now when I say remake. I mean remake. The whole map is different now, and comes with unique items that aren't available on other maps. You guys got to try this.
I wish those items were available on all the maps. At least the sexy Madreds equivalent, and the Heart of Gold/Brutalizer combo.
The Madreds equivalent is a bit less sexy when I realized the entire map looks like a giant Maxi pad, though.