I saw that Mike White mentioned my name, so I thought I would comment directly. A lot of the discussion is about papers published in second-tier venues, but from my perspective there are also major problems with DL NLG papers published in top venues. Perhaps less drastic, but its a question of degree.
This was brought home to me last year when I attended NAACL 2016 (in order to give an invited talk on NLG evaluation), which was the first time I had been to an ACL event in several years. I went to listen to a NAACL paper about using DL for NLG, and was absolutely horrified.
(1) The evaluation was weak, because the authors just used BLEU, which is a questionable way to evaluate NLG systems (https://ehudreiter.com/2017/05/03/metrics-nlg-evaluation/)
(2) One of the main training corpora used was the output of a rule-based NLG system (https://ehudreiter.com/2017/05/09/weathergov/). So were the authors trying to show that they could use DL to reverse engineer a rule-based system and steal the IP of someone who spent a lot of time carefully hand-crafting NLG rules?
(3) The presenting author was completely unaware of previous work in the NLG community on the problems he was solving (this was apparent in the Q&A session as well as in the paper). He claimed his system was better than state-of-the-art, but to me his output texts looked considerably worse than stuff we were producing 15 years ago.
I am willing to be convinced that DL is a good approach for NLG, but I need to see experiments and papers with solid evaluation, sensible and appropriate corpora, and go0d awareness of NLG state-of-the-art. Papers like the above NAACL one dont leave me with a good impression of DL for NLG.
I’d also like someone to explain to me how we can evaluate the worst-case (as well as the average case) performance of DL systems, because this is really important (https://ehudreiter.com/2016/12/12/nlg-and-ml/).
Finally, to echo some of the other opinions which people have expressed, there is a caricature of a DL (or indeed ML) NLP researcher as someone who just wants some corpora and a way to keep score, and has no interest whether the “score” means anything and also no interest in the provenance or suitability of the coprora. I realise this is a caricature, but I think it has some truth, and I dont think this is the right attitude for making progress in NLP.