Too short? Yeah, it is kind of short relative to games like TOTSC for BG1. But to be honest, I enjoyed the new areas a lot as well as playing IWD over again (probably over and over). Since I really enjoy the IWD/HoW experience, I think the expansion is still an worthy add-on and I definitely don't mind spending my $37 CDN dollar on it.
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Long live H22A1!!!!!