For the most part, Kyoushi mo Iroiro Aruwakede is sweet, but rather disposable yaoi: an inept uke and a capable seme meet, the seme helps the uke with his problems, an attraction between them occurs, the uke fights his feelings, the seme is patent, the uke finally comes around, and a happy ending occurs. Add in a couple of minor misunderstandings and a potentially interferring 3rd party, and you have a scenario that is replicated in 90% (or more) of all yaoi. So why should you read Kyoushi mo Iroiro Aruwakede instead of any other series that uses this basic plot?
Because as conventional and innocuous as Kyoushi mo Iroiro Aruwakede is, it also does a few things a little differently. Yes, the uke Komori is inept (only as a teacher), but he's not helpless. Both uke and seme are drawn like men; who will play what role is not immediately obvious from their outward appearances (which is a very hapy thing for me, as I read Yamato Nase strictly for her semes, her shota-esque, doe-eyed ukes make me cringe.) In fact, because Komori looks every inch the adult that Takigawa does, the relationship between Komori and Takigawa is one of equals as both men treat one another with professional and personal respect (rather than the annoying parent/child dynamic that characterizes most uke/seme relationships.) The problems that occur in the series are not due entirely to Komori's misunderstanding of Takigawa's feelings or his lack of confidence as they usually are in most yaois. Both uke AND seme cause problems in Kyoushi mo Iroiro Aruwakede. As a guy who's had relationships before (though not with other men), Komori is just as capable as Takigawa is of thinking through those problems when they occur, which is refreshing.
Also nice is the fact that Komori trying to become a better teacher is an important sub-plot (the romance isn't the only plot being developed here). And most unusual of all, actual bad sex occurs in this manga. I can't remember the last time (if ever) that I saw that in a yaoi.
So all in all, I would say that this manga is worth a read as the art is nice, the story is cute, and the characters aren't totally cookie-cutter yaoi cliches, but it's probably not worth keeping as it doesn't blaze any new trails either.