Microsoft Corp, Sony Corp, Electronic Arts and other industry giants whipped up the crowd of gamers and developers at the event into a frenzy, with displays of high-powered new consoles and previews of popular genre games.
For an industry accustomed to dwindling revenue in recent years, the pervasive visual pyrotechnics offered something to look forward to after years of subsisting on franchise-oriented games such as "Call of Duty" and "Halo" that run off aging technology.
This fall will usher in the Xbox One and Sony PlayStation 4, which apart from being more powerful than their predecessors, now support cloud-based game play and mobile integration.
It remains to be seen whether these will avoid the fate of Nintendo Co Ltd's Wii U, whose disappointing sales since its late 2012 launch have forced the Japanese company to sharply curtail revenue forecasts.
The Xbox One will sell for $499 and the PS4 for $399 - a hefty bit of change in an era when free-to-play Internet and smartphone games from "Angry Birds" to "Clash of Clans" are attracting budget-conscious gamers and millions in investment.
"The graphics capabilities of console games are going through the roof, but mobile games are becoming more and more sophisticated too," said Mike Cuff, vice president of content at Wikipad, which launched a portable gaming tablet at E3.
At this year's E3, which will end late on Thursday, the debate raged around how Microsoft and Sony will treat used games, a segment that is growing quickly because the Facebook and iPhone generation seem to be moving away from the traditional practice of shelling out for newly released, highly marketed franchise titles.
"Sony and Microsoft still have work to do in order to convince a broad consumer base that they need to spend $400 or $500 on new hardware, in addition to $60 for each new piece of software," R.W. Baird analyst Colin Sebastian said.
"There doesn't seem to be as clear a reason to upgrade compared to prior cycles, which introduced DVDs, 3D and HD to consumers."
According to industry tracker NPD, sales of videogame hardware and software have fallen every month, on a year-on-year basis, since January 2012.
Still, industry executives were encouraged by the enthusiastic response they received at E3.
"There's been a lot of confusion about, 'Hey, with the rise of tablets and phone games does that have some impact on consoles?' Not at all," said Yusuf Mehdi, senior vice president of Microsoft's Interactive Entertainment Business. "All that's doing is bringing more people to the world of gaming."
The high level of excitement at the convention, driven by the faceoff between the Xbox One and PlayStation 4, was the noticeable difference from last year, said Keza MacDonald, editor at games news site IGN.com.
Developers fed off that excitement by showing off what they envisioned as franchises in the making.
EA unveiled "Titanfall" with mech-style soldiers and robots, a project led by Vince Zampella, a co-creator of Activision Blizzard's "Call of Duty." Ubisoft Entertainment SA announced "Tom Clancy's: The Division," a role-playing shooter revolving round a pandemic that breaks out in New York on Black Friday.
"The good news is, we entered the show thinking, 'Why do we need consoles anymore?' We're leaving the show with, 'Which one would you like to buy?'" said Peter Moore, EA's COO. "That's a win for the industry coming in here."
New hardware and software will boost the video game industry's growth in 2014, Ubisoft Entertainment SA Chief Executive Officer Yves Guillemot said.
Still, questions remain over how long the good vibes will last or whether the crowd at E3 is representative of a much broader swathe of casual and mobile game players out there.
"In the near term, we see pent-up demand among core gamers for new hardware and software, which should deliver a strong launch," R.W. Baird's Sebastian said.
"Beyond that, we still need more visibility that Sony and Microsoft can safely avoid a stall-out like what is currently plaguing the Wii U.
© Thomson Reuters 2013