I'll start with some background on myself, in accordance to anime/manga: I like watching and lately, since 2008 reading those which have or are dramatic, particularly hentai manga's. The slow progressive start of the plot to the climax, and then the finale. This has to be very clear and thorough. Onegai Teacher manages to show it in manga form. The manga may not have various scenes provided in the anime, such as the beach arc and the parts which include the male Sensei (the guy who likes planes), but it surely doesn't lack nor stop to accomplish the drama which it intended to show and gain support of from the fans. And unlike the anime, it doesn't end in cliffhangers, as far as I can remember.
It doesn't stop there, there are other aspects which to me are better than the anime, it's supposedly based from. For example, puns. For someone who understands verbal Japanese quite well, especially when it comes to puns, the anime fell dearly short, the acting was weak, and when you would think they would put it up a notch, it failed. In the manga, however, those puns are clear and quite entertaining. My only disappointment if I had to say would be the lack of "echii-ness or nudity (like the anime ova)," although the drama does back that enough to not think about it. In the end, I nearly came to cry because of the way it ended, and probably would have if I was listening to a depressing tune of something. I would wish anime and manga companies make more dramatic stories like this, especially dealing with teacher/mother and son/student scenarios.
In short, taking MAL's system to mind, perfect for the story, perfect for characters, perfect for enjoyment, art could have been a little better, but for it's time it was the average, I guess. Overall? I stand by what I mentioned at the beginning.
