Boku no Ie ni oide Wedding I didn't like for the same reasons I didn't like this arc: the 3rd wheel is extremely arrogantly intrusive and the FMC is about a smart as a lead weight and is more concerned with the 3rd wheel than the MC (in this case, her husband). However, this series aggrivated me far more than Risouteki Boyfriend, particularly since the 3rd wheel was after the FMC for practically the whole series.
The 3rd wheel in Fushigi no Kuni no Arisugawa-san isn't all that arrogant or intrusive, but he does try to steal his best friend's girlfriend (who is also as dumb as a concrete block). Annoying, but nowhere near the rage-inducing actions of the 3rd wheel in Risouteki Boyfriend.