Halo: CE certainly had more biomes, I suppose. Though I could get technical and distinguish between areas on Infinite’s landmass that have marshlands, plains, highlands, and barren wastelands. But content-wise? No.
Halo: CE had 8 weapons (5 UNSC, 3 Covenant), two grenade types, and 5 vehicles (2 UNSC, 3 Covenant - including Shade turret).
Halo Infinite has (including variants) 12 vehicles (7 UNSC, 5 Banished - including Shade Turret), 49 weapons (17 UNSC, 26 Banished, 6 Forerunner), 4 grenade types, and 4 types of Equipment.
I would very much wager with more to come.
Absolutely. At the time of Halo 3, we’re told about the planetary destructions, but we never see it. From what we’re shown, it’s not really evident that the Covenant is that much stronger. The biggest evidence of that is the opening of Halo 2, but even that invasion force is punked very quickly. And we never really see the full power of the Flood; they take over High Charity as all the leadership abandons the city and leaves it for dead.
So yeah. For what we’re shown, the defeat of the Covenant and the Flood is laughably pathetic.
Whether or not the map is boring or not is highly subjective. As I’m sure many can guess, I don’t find the map boring at all. I don’t need a Snow Level or a Lava Level to take interest in the area that I’m exploring, and despite a relative similarity Infinite’s map does offer areas that are both unique and rich in implied story for those who care to see them.
Actually, no. That story is told through Cortana’s memories (cutscenes and gameplay moments) and from what Fernando tells the Chief (cutscene). The stories told in the Audio Logs are either a minor prologue (evacuation of the Infinity) or complete side stories (the Spartan Logs, which will be explored more in an upcoming book, and various UNSC logs of minor events). The main storyline is told entirely through cutscenes and in-game moments.