Apparently, I am not the first person with that idea: Instead of creating I am referring to "The World Atlas of Language Structures" (WALS).
WALS Online is a joint effort of the Max Planck Institute for Evolutionary Anthropology and the Max Planck Digital Library website and it has a lot of great maps comparing various grammar features of languages all over the world.
So the first world map I looked up was, of course, "Reduplication"
(Rubino, Carl. 2011. Reduplication. In: Dryer, Matthew S. & Haspelmath, Martin (eds.) The World Atlas of Language Structures Online. Munich: Max Planck Digital Library, feature 27A. Available online at http://wals.info/feature/27A Accessed on 2013-07-06.)
Unfortunately, Kurdish is not included in the map for reduplication but just based on the overall distribution of it, one can say that reduplication is a very common language feature (except in Europe), not having reduplication in a language is actually "weird".
The next feature I looked up was "Order of Object and Verb" in a sentence.
(Dryer, Matthew S.. 2011. Order of Object and Verb. In: Dryer, Matthew S. & Haspelmath, Martin (eds.) The World Atlas of Language Structures Online. Munich: Max Planck Digital Library, feature 83A. Available online at http://wals.info/feature/83A Accessed on 2013-07-06.)
In Kurdish the Verb is at the end of the sentence, so the object comes first. This sentence order is called Object-Verb or simply "OV" (highlighted in blue in the world map).
Most languages have the "OV" or the "VO" sentence order, but very few use both orders depending on the situation and sentence. Languages like Armenian or German don't have a dominant order, which is pretty weird.
Next, I looked up "Gender Distinctions in Independent Personal Pronouns".
(Siewierska, Anna. 2011. Gender Distinctions in Independent Personal Pronouns. In: Dryer, Matthew S. & Haspelmath, Martin (eds.) The World Atlas of Language Structures Online. Munich: Max Planck Digital Library, feature 44A. Available online at http://wals.info/feature/44A Accessed on 2013-07-06.)
In Kurdish there is no gender specific "he" or "she" just "ew/v" ( "o" in Zazaki), so pretty easy grammar rule. Turkish, Basque, and Hungarian is like that as well.
Contrary, Arabic has not only a gender specific "he" (huwa (هو)) and "she" (hiya (هي)) but also for the 2nd Person Singular "you" masculine anta (أنت) and feminine anti (أنت). Moreover, Arabic has a gender specific 2nd Person Plural "you": masculine antum (أنتم) and feminine antunna (أنتنّ) and a gender specific 3rd Person Plural "they": masculine hum (هم) and feminine hunna (هنّ), not so easy grammar rules. Arabic also has 2nd Person Dual "you two" antumā (أنتما) and 3rd Person Dual humā (هما). Based on the map, it seems like that Spanish picked up some of these weird gender rules from Arabic (from the Moors?).
These are just a few language features I covered here. The list of maps on WALS Online is long, everyone who is interested in languages should definitely take a look at other maps as well.
The website Idibon ("Language Technologies for a Connected World") went through the provided data of the WALS Online website and determined the "Weirdness-Index" of each language.
Here is a quote from the Idibon website how they defined weirdness:
This is odd. Is this odd? One of the features that distinguishes languages is how they ask yes/no questions.The vast majority of languages have a special question particle that they tack on somewhere (like the ka at the end of a Japanese question). Of 954 languages coded for this in WALS, 584 of them have question particles. The word order switching that we do in English only happens in 1.4% of the languages. That’s 13 languages total and most of them come from Europe: German, Czech, Dutch, Swedish, Norwegian, Frisian, English, Danish, and Spanish.
A total of 21 "weirdness" features were compared, only languages that had data for at least 14 features were included in the final ranking, however, they calculated the "Weirdness-Index" for the other languages as well. The Kurdish "Weirdness-Index" is 0.781 but Kurdish was excluded from the ranking (only 12 features compared), otherwise Kurdish would have been at position #26, so Kurdish is pretty weird.
One of the weirdest language families seems to be the Germanic language family.
Some of the more known languages, their ranking and Weirdness-Index:
#9 Armenian (0.861),
#10 German (0.858),
#11 Abkhaz (0.844),
#12 Dutch ( 0.844),
#16 Norwegian (0.828),
#21 Czech (0.791),
#23 Spanish (0.790),
#25 Mandarin (0.789),
#33 English (0.756),
#40 Japanese (0.736),
#57 Greek (0.669),
#75 Persian (0.649),
#77 Hebrew (0.639),
#111 Polish (0.564),
#159 Finnish (0.466),
#181 Russian (0.401),
#217 Lithuanian (0.257)
#226 Turkish (0.214),
#230 Basque (0.189),
#235 Hungarian (0.132)
#239 Hindi (0.087).
More details can be found in the provided Excel file.