If anything the concern would be him being a bad copy of Mettaton.

So why did I end up liking Tenna way more than Mettaton? To the point that Tenna almost feels like Toby's chance of doing Mettaton right? I can't help think that part of it is, aside from the obviously more effort that went into Tenna, was just the simple fact that Tenna was more likable due to how being downtrodden and neglected was a major character point. Mettaton was written to be too much of a Hot Shot in Undertale for me to like him that much.