From what I recall. The 2017 presentation was very positive on Odyssey and Xenoblade 2 was still positive but they said 2017 so many didn't believe themlol.2017 up front had a mixed reception, because during the January presentation several games looked questionable(Odyssey, Xenoblade), people complained that Splatoon looked more like an expansion, and the lineup was WiiU port heavy. That was problematic considering how dire the software situation had been for Nintendo in the year or two prior. As the year progressed it was more well received because all of the new games delivered/over-delivered, some of the ports were welcome additions, and more things were announced.
In hindsight though it looks particularly good because subsequent years, which had seemed more promising than 2017 due to hardware/software consolidation, ended up not matching 2017 1st party wise.
the biggest kicker was that everyone was believing a bunch of fakes leaks for games that didn't exist and a price of 250 that wasn't the actual price of the switch. Then Nintendo starting the presentation with ARMS and 1-2 Switch was enough to convince a large portion of the crowed to think Nintendo was going "causal"