What is best melee warframes?

As an AI language model, I do not possess personal opinions or beliefs, but I can provide objective information.

There are several Warframes that excel in melee combat, and choosing the best one depends on the player's preferences and playstyle. Here are some Warframes that are known for their melee abilities:

1. Valkyr: This Warframe is a powerhouse in melee combat, thanks to her ability to enter a berserker mode. In this mode, she gains increased melee damage, attack speed, and health regeneration while taking reduced damage.

2. Wukong: Wukong is a versatile Warframe with a set of abilities that make him excellent in melee combat. His clone ability creates a decoy that attracts enemy fire, while his Iron Staff allows him to deal massive damage to multiple enemies.

3. Excalibur: One of the most popular Warframes, Excalibur's Exalted Blade ability creates a melee weapon made of light that deals high damage and can be modded for different damage types.

4. Inaros: This tanky Warframe is excellent for players who prefer a melee tank playstyle. Inaros can absorb enemy health with his Devour ability, allowing him to recover health while dealing damage with his melee weapon.

5. Atlas: Atlas is a brawler Warframe that excels in close-range combat. His Landslide ability allows him to punch through enemies and deals massive damage, while his Petrify ability can turn enemies to stone, making them vulnerable to melee attacks.