Actually, I've done my research and I've found out Notepad++ is a lot better than Metapad in terms of features.
How? Importantly, syntax highlighting is a feature that metapad lacks. Bracket Matching, folding code and automatic completion is something notepad++ has that metapad doesn't. Metapad doesn't have a built-in compiler. This makes metapad worse than a lot of the text editors I've mentioned above.
I can't mention all now but just getting used to Notepad++, you'll notice a lot of features other text editors don't have.
And seriously, you like the UI of metapad more than notepad++?