I agree that the Ranger suits are pretty much impenetrable. However, I think that if they absorb too much damage, they overload, causing the Rangers to de-morph.
This is a tough one. If I had to pick one, I'd probably go with X-men. Shadowcat is a tremendous asset due to her intangibility, especially as she is also a good fighter due to Logan's training. Logan himself would also give any Ranger a good fight. Cyclops's optic blasts are apparently more powerful than the Ranger's weapons too.
Sentinels are what 50 feet tall? The Zords accidently destroy buildings with a wave of their arms. Not to mention they don't have any powerhouses to destroy them. Maybe Cyke can damage them. But I seriously doubt it.
Any kind of Power Ranger, from the Mighty Morphin to the Lightspeed Rescue possess enhanced strenght, durability, speed, reflexes, stamina and various weaponry.
If the rangers call in the Zords, the X-Men are screwed.
A single blast from a Zord can kill all of those in that X-Men roster.Plus Zords can resist to space vacuum and ocean pressure, Cyclops blast is nothing they can't handle
True, but remember that Rangers aren't supposed to use Zords against human-sized opponents (although they will if they are desperate). Part of their code is "never escalate a battle unless forced to."
If they get a chance to. . . You realize the first time one of them punches through a phased out shadowcat with the are that has there comunicater. . . FZZT. . . Because I have seen those not work before.