This teacher apparently had a Shirou complex when he was younger, but as opposed to Shirou, he actually listened to Archer and gave up. At least until it got personal.
But yeah, this wasn't overly impressive. Forgetting the simple plot, the humour is getting scarce as well, precisely like I feared. It's not like I'd have wanted to watch an incompetent MC for too long, but most of the comedy was based on that. Now he's not only strong with an even stronger history, but he's also teaching enthusiastically, as opposed to trying to avoid all responsibility and work.
I'll still give this more chances, though.