Anecdotal evidence, but you do you I guess. If you've never played WC3 then RF will be worth checking out, though the lacking animations, graphics that aren't up to 2020 standards by any means, AI & pathfinding from 2002 etc, will be noticeable. You can still just play the original, which holds up just fine today, barring the downgrades RF imposed on it. The same does not go for ME3, which is a real game, not a remaster.
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See the difference is that Classic is a new game in a sense, since Vanilla hasn't been available since 2006. WC3:RF is a graphical skin on a game that still exists, which before the release of RF was superior.
Yes Classic isn't a perfect copy of Vanilla, but it made Vanilla available again, even if only a snapshot of what Vanilla was.