If you think it's being passed over then you need to try and generate interest in the language, like posting articles about it you find, or if you find none, write one.
Same goes for benchmarking, it's unlikely that people who aren't interested in the language will write benchmark-versions for that language so it's up to those who are interested in it to provide them.
Which is what someone did in the Rogue Level Generation Benchmark where I recall Nimrod performed very well.
http://togototo.wordpress.com/2013/08/23/benchmarks-round-tw...
From my own very cursory glance I'm not quite sure why you would compare Nimrod directly to Go, I think it's more aptly compared to something like Rust, with both having optional garbage collector, generics, macros etc.