You should be happy. You'll be happier if you can awaken him.
That's up to you. I like Silver Centurion over Guardian but I'm a weirdo. If you're wanting to take full advantage of what S.C can do, you'll want to awaken him. The fact that you can quest with him and Mole Man (who's now great) is even better because that synergy is clutch. His DoT effects bypass regular immunities since they're passive. On most of the tech paths for MEQ's, he's super easy to build up and destroys that chapter. He's bleed and shock immune with an armor up which is awesome for many paths in this game. Once you have plasma on a defender, hitting with a medium does nice burst damage. He has a 28 second slow on SP3 and access to slow on heavy which is also awesome for those evade nodes. He's so much easier to use than Guardian as well.