jean grey isnt the only x-men member who makes the sentinals look like rag dolls. ahh, most of the x-men have sentinel slaying down to a science. However, five sentinals to everyone one x-man is a whole lot of god damn sentinels. I dont think the x-men would last very long, but they would have miles of broken sentinels to show for their deaths.
You still need to be more specific. "All of the X-Men" includes current X-Men like Juggernaut, Beak (?), Emma Frost...and a bunch of others that aren't "Classic" X-Men like Wolvie, Cyclops, Xavier and their ilk. Without knowing exact people, most forum members won't have definite opinions and will be reluctant to post on this thread.
Also, like RR said, if there's a bunch of X-Men, or if it's like you say and it's 'all' of them, bursts of 5-6 Sentinels should be no problem for a long time...they could just take them out indefinitely until they eventually got really tired. Even then, they could probably go on shifts and just keep killing Sentinels. With a vast # of X-Men, it would take a vast number of Sentinels to do any damage.
-DM
specify teams, and 5 sentinels at a time is wayyyy too little, unless we are talking about Morrisons mega sentinels which destroyed Genosha, but those have mostly unknown capabilities and probably shouldnt be included.
Sentinels were mostly known for sucking and being useless until Genosha got slaughtered by them.