Her rappel is irritatingly bugged in manners that don't make sense, such as: I click to rappel to a target from out of range, I walk up to the edge of the previous range indicator and the game registers that this range is, in fact, no longer in range of rappel, and my character stops moving in a manner that seems to indicate, "I cannot perform that action."
Additionally, if you lose sight of a target, or if a target moves out of range as your rappel is ascending, you will have to reselect the target to descend on them, (if they're in range, which is likely not the case).
Elise's W is an auto-attack reset, hit once, then hit W to immediately attack again.
Elise's spider form Q acts as a gapcloser for her and her spiderlings and also registers as a movement ability and is disabled while rooted. This means that you can also use the spider form Q on creeps in order to quickly dodge skillshots or create distance while running away.
Most people will not react properly if you run away, then upon entering a bush or turning an unwarded corner rappel onto the target and run the opposite direction. Nine times out of ten, you will live.
Elise's spider form Q (execute) has a cap damage total of 395 to neutral minions that does not scale and is thus not the extremely overpowered objective securing tool everyone thinks it is.
When AP, Elise stays relevant throughout the game, assuming you do not fall far behind, as an extremely dangerous catch-based mage. In this situation she can burst for nearly three thousand damage, and her skittering frenzy (one of the highest attack speed steroids in the game, and an auto-attack reset) will cause a DPS upwards of 700-800.
Elise's "Volatile Spiderling" has good base damage and decent scaling and should be respected as a skill. If aiming at a target is not possible, or you miss, always remember that you can re-target via "Venomous Bite".
Elise has the best skin in the game.
Elise was the best champion in the game.
Elise, even in her olaf'd state, is extremely strong in the hands of a capable user.