Yes, BUT, they are a new developer and, even though its Halo, its practically a new IP. Even if they didn't want to spoil anything, you would imagine when showing off their levels they would be showing something great (as the rest of the game should be) that is ingame and fresh. For example, when my team and I showed off Lumoria: Episode Two the first time, we showed an actual encounter in the game to show how gameplay has improved. The only way to show off good level design is by showing off gameplay of an actual level, there isn't any other way because in those just turn into montages and trailers. So far what they have shown rely's heavily on scripted cinematic moments like COD and are fairly linear in design. Even the last mission they showed off where you disable the power cores was fairly boring and dull looking. I'll save my judgement for when the actual game is released to the public, but so far for first impressions it doesn't really have me sold.