Dogecoin is a old and trusted coin. They have kept it simple and friendly. With a helpful community and safe hidden payments.
Doge is a commonly used meme, there approach to the coin was to be much more lighthearted than bitcoin. Not so serious. It is one of the only top coins with a mascot.
Dogecoin has payments in under 5 minutes, so it is much faster than bitcoin. Lots of coins circulating so it makes working out payments easier than bitcoin.
Do i think Dogecoin will ever pass bitcoin? No not likely as it is too much of a joke.
But does it deserve to be top 50 coin? Yes. As it is easy to use and user friendly. There is no need to go on and on about your tech just to make a simple payment, like some other coins.