The opening hymn of Rig Veda is for Agni , the god of fire I am assuming . And then there are many more hymns , but then there're ones for Vayu, Mitra, Indra, and so on for the other deities.
The verses indicate Agni is grand and divine.
However , we see in the Kenopanishad, after having a victory over the demons, the gods rejoiced in ego and the Brahman assumed a Yaksha form to break their ego .
Brahman, according to the story, obtained a victory for the gods; and by that victory of Brahman the gods became elated. They said to themselves: "Verily, this victory is ours; verily, this glory is ours only."
Brahman, to be sure, understood it all and appeared before them. But they did not know who that adorable Spirit was. 3—6 They said to Agni (Fire): "O Agni! Find out who this great Spirit is." "Yes," he said and hastened to It. Brahman asked him: "Who are you?" He replied: "I am known as Agni; I am also called Jataveda."
Brahman said: "What power is in you, who are so well known?" Fire replied: "I can burn all— whatever there is on earth." Brahman put a straw before him and said: "Burn this." He rushed toward it with all his ardour but could not burn it. Then he returned from the Spirit and said to the gods: "I could not find out who this Spirit is," (from Chapter 3 of Kenopanishad)
Thus, we can see Agni who was very egoistic about power to burn all earth is unable to reduce a single piece of straw . Next to be humbled is Vayu who couldn't blow away the same straw.
Indra is made of this realization. Note that indra doesn't see or question the yaksha which is a hidden metaphor of the fact that senses (indriya) can't see the lord.
So , the question is Is Agni and Vayu great because they're eulogized in mandala 1 of Rigveda or are they not so great because they are subject to ego and got their egos broken down by supreme deity.
PS : On a humorous note, one can add I may not be sitting and typing this if it were not for agni (temperature) in my body. :P