There is often a risk-reward spectrum in life. The higher the risk, the greater the potential reward. The same goes with Kubo-san, an anime which takes little risk, but fails to deliver anything substantial. It does have some redeeming features, though.
The concept of an "invisible person" is an interesting one, which if utilised correctly, can deliver deep, insightful messages to viewers. Kubo-san could have delved into a powerful backstory where the protagonist commits a grave sin in his formative years and is ostracised, or where his "invisibility" stems from a social inability to interact. Instead, the rationale behind Junta's invisibility is "just because": very safe in avoiding lengthy character development, but a low-risk, low-reward decision.
Perhaps the biggest risk the anime takes is its portrayal of Nagisa, who clearly harbours feelings for Junta, yet is proactive and sadistic and romantic (my dream girl). Nagisa being a quasi-dominatrix is not unheard of in anime (e.g Nagatoro), but it does add an interesting character element which lifts the very bland personality of Junta. It adds humour, heightens interest from the audience, advances the plot, and caters to those who are submissive. However, a big worry I do have for the remainder of the season is that Nagisa loses that sadistic attitude as she and the protagonist inevitably get closer, and with it, the biggest risk (and reward!) this anime provides.
The art style of this anime strikes a nice balance without being too stick-figure like or oversaturated with colours. It is a lovely art style which makes watching this anime a lot easier. For those who appreciate the art in anime, this may be worth a watch. Perhaps another reason to watch this anime is its star-studded lineup of voice actors. The inclusion of Kana Hanazawa often indicates an anime will have excellent voice acting; Kubo-san is no exception. The OP and ED, however, are disappointing: they are very plain idol songs. Every romance anime seems to have them, and it's always the same low-risk, low-reward thing: teenage girls (or heroine VA) singing some lyrics about love, with melodies that can be forgotten in 10 seconds.
As an afternote, postponing and re-airing the anime seems like a wise production choice in upholding the nice art style and ensuring decent storyboarding; my future review may evaluate whether this was done.