I'm pretty tired of languages that claim 'erlang-style' concurrency without any of the erlang features that actually make it useful (process isolation, link/monitor, supervisors etc).

EDIT: Personally, I would also add to the above list: algebraic data types, optional static typing with a (mostly) sane type system, no inheritance / minimal indirection, immutable by default, (reasonably) good introspection, support for live code replacement.