Here's the drill, they face:

1. Genosha gaurds armed to the teeth with:
-Repulsar based fire-arms and canons
-Knives and high-tech body armor
-Hover bikes
-Skilled in H2H

2. Mechanoids:

-Sentinels including a handful of omega level mutants
-miniture sentinels
-Genosha heavily armed mechs with electron disperser
- Minutrue mobile torrents with an A.I. capacity

3. A device that can create copies of team members

4. Brood & Brood Queen

5 . Major X villians:
Tuskettes
Tusk
Apocalypse
Omega Red
Juggernaut
Acolytes
Exodus
Magneto