Esperanto, Worth Learning Or Completely Useless?

The largest discussion around the 'easy to learn language' Esperanto, is whether or not it is a complete waste of time or a massive benefit to your language learning progress.

The Pros:

1. Esperanto is made up of a large amount of vocabulary derived from european language families. This gives you two main advantages. Many words are intelligible to english speakers, even if they have never seen them before, so Esperanto can be learned very quickly with arguably less effort. This will also aid you in learning other european languages, helping you to consolidate words in two or more different languages; leading to more fluent conversations in european languages. In fact, a group of students who learnt a year of Esperanto and a year of French spoke better than those who exclusively learnt French.
2. Esperanto makes complicated grammatical elements in other languages easy to comprehend. The language has the accusative case (neniam forgesis la acusitivon) which is present in German, Finnish and slavic languages. Normally, this is quite difficult for english learners to understand as they are typically mixed in with other grammatical features, but Esperanto makes learning the accusative case much easier due to its simple grammar. The language also happens to be completely regular, decreasing the amount of exceptions needing to learnt.
3. In French, to have a decent conversation with someone it could take a couple thousand words to achieve this. Topped off with strange pronunciation, lots of slang and odd grammar, French can take a lot of time to even get started talking. However, Esperanto is ridiculously loose in many of its aspects. Words that you already know can be combined into ones you don't, 'mal' can be added to the start of the to make a word mean the opposite and has default word order. This means you can make a sentence in Esperanto in one hour that would take two to three hours in a lang like French/Spanish.

The Cons:

1. Many claim that Esperanto is too 'eurocentric' for a language that is supposed to be simple to study for everyone; and I'd agree. Esperanto's vocabulary really benefits indo-europeans, but others not so much. In my opinion it would probably be a waste of time for a Korean to learn Esperanto over English, as in their case it would take a long time to learn each.
2. There are currently about two million and growing; which in language terms is a massive amount. However, they are very sparsely placed all over the world, making it hard to talk to Esperantists in real life. This could be a massive turn off for some language learners, but services like pasporta servo (airB&B for Esperantists).
3. While the language is heavily based of indo-european languages and sounds natural enough, it can sometimes sound a bit repetitive and odd. This is because it is an intentionally artificial constructed language; stopping it from rolling off the tongue