If a language lacks the following, it is shit

- Typeclasses
- Parametric polymorphism (* -> t)
- Dependent types (t -> *)
- Higher kinds (* -> *)
- Purity

>>14
Tests make you waste your time and force you in the hell of eternal boredom.
Contracts only detect issues only when the contract is broken - it forces you to waste time writing tests if you do not want your users to get contract errors (and you still can't guarantee that).
Contracts slow down the program.
Contracts are optional so if you forget any of them you are in for a world of pain.