\usepackage{adjustbox}
\usepackage{array}

\newcolumntype{R}[2]{%
    >{\adjustbox{angle=#1,lap=\width-(#2)}\bgroup}%
    l%
    <{\egroup}%
}
\newcommand*\rot{\multicolumn{1}{R{45}{1em}}}% no optional argument here, please!

\begin{document}

\begin{tabular}{r|ccc}
&
\rot{Property 1} &
\rot{Property 2} &
\rot{Property 3}
    \\ \hline
System 1        &       &       &  X    \\ 
System 2        & X     & X     &  X    \\
System 3        & X &   &  X    \\ \hline
\end{tabular}