While the guaranteed loss is quite annoying, as someone that plays ARAM's I'd be even more annoyed with remakes. Sometimes you just want to play the game, regardless of the outcome. Waiting through queue, champ select and loading screen can easily take up to 5 minutes, and waiting for remake would be another 3 minutes (assuming its the same as Summoners Rift, which it should be).
Remaking an ARAM after wasting 8 minutes is kind of bad for a lot of people who just like to join ARAM to chill. I don't know many people who really fuss over whether or not they win. It's a "why bother" situation. While I'm not completely against remakes in ARAM's, you'd be ignorant to not realize there's downsides to this for casual players.