Originally Posted by Argo
Ignite is frequently used bot lane in competitive play. It shuts down the heal meta and any time there's a kill lane bot, Ignite is extremely strong. Terrible advice to say never run ignite bot lane.
I think it's easy to say that if they're at the said ELO range, they aren't a high level competitive player. While ignite is good on champions such as Ezreal and Tristana because of their built in positioning mechanics, it's more ideal for those in this range who aren't exactly the most skilled to take exhaust or heal for the extra defensive summoner. I'm sure you've thought to yourself "no escapes, great" when your team's AD carry isn't running any escapes/defensive summoners.
Ezreal is my favorite AD carry to play, but I think I can safely say that most people don't know exactly how to use him correctly for maximum burst or efficiency in general (same goes with Kayle). As said in the guide, if the player is pretty good with the champion and is very familiar with it, then let them play. The suggested ones are just for those who are looking for some advise/help as to which to play.
I like the amount of discussion going on already in this topic, keep it up!