X-Men: Legends - Game Guide - The Gamers Temple

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[5.4] Sentinels
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The ultimate mutant-killing machines, Sentinels of various types pop up 
throughout X-Men Legends. However, rather than inspiring fear and 
trepidation, they are more like an obstacle that needs to be brushed out of 
the way. For all the terror they are supposed to induce, they are really 
rather easy opponents.

[5.4.1] Sentinel Alpha
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Health: 100
Resistances: Mental
Powers: Energy beams, missiles, strong melee attacks
XP: 67

These are the Sentinels you fight in the Sentinel Flashback scenario. They 
don't have much in the way of health and aren't resistant to physical 
attacks. Wolverine's Brutal Slash or Nightcrawler's Teleport Flurry is the 
way to take them down, especially if you can combo it with Cyclops' ranged 
attack.

[5.4.2] Sentinel
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Health: 500
Resistances: Mental
Powers: Energy beams, missiles, strong melee attacks
XP: 283

A stronger Sentinel you first encounter on board the Arbiter. Taking it 
down is the same as any tough foe--lots of combos. Storm and Cyclops, with 
their energy ranged attacks, are good against these behemoths, as is Rogue 
with her mutant-powered smash and Nightcrawler, since he is hard to target. 
By this time, you should be able to buy and use the Hammer of Nimrod, which 
will make disposing of these robots even easier.

[5.4.3] Sentinel Controller
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Health: 600
Resistances: Mental
Powers: Energy beams, missiles, strong melee attacks
XP: 2071

An even bigger, badder Sentinel that uses a lot more energy beam attacks.

[5.4.4] Sentinel Mark II
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Health: 1500
Resistances: Mental
Powers: Energy beams, missiles, grenades
XP: 6647

These more advanced Sentinels first show up in the Sentinel factory. The 
Hammer of Nimrod equipped on an X-Man with a powerful ranged attack or on 
Nightcrawler will take them down quickly.

[5.4.5] Sentinel Platform Mark II
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Health: 5000
Resistances: Mental
Powers: Lots of weapons
XP: 117987

Also known as "spider Sentinels", these are the toughest anti-mutant robots 
in the game. The Hammer of Nimrod gives you an advantage, and you need 
every advantage you can get.

[5.4.6] Sentinel Advanced
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Health: 800
Resistances: Mental
Powers: Various ranged attacks: energy, freezing, fire, etc.
XP: 37331

These cyborgs first show up in the Sentinel factory. They're actually not 
as hard to deal with as the larger Sentinels.

[5.4.7] Sentinel Advanced Mark II
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Health: 1200
Resistances: Mental
Powers: Various ranged attacks: energy, freezing, fire, etc.
XP: 88491

These are the Sentinels that attack Asteroid M during the final mission. 
They should not present you with much of a problem.