I'm thinking about playing a mage of some sort. Battlemages are appealing for their survivability, but I know that the armor impedes spell efficiency so a more traditional mage might be better. Some advice from people who have played them would be greatly appreciated.
Also, as far as the Atronoch birthsign and spell absorbtion- Is there a way to keep it from absorbing self cast spells like healing or protection? It seems like a bad birthsign to take...
Thanks.
When you get good skill with an armor, your spell penalty will decrease to 5%. This is not a big deal unless you intend to use illusion mind control type spells on high level foes. For that you would need 100% spell effectiveness (no armor).
Spell absorption does not affect your own healing or shielding spells, so that is not a concern. The only self-aborption quirk with it is telekinesis (which can actually be used to add to help fill up your blue at higher levels of mysticism skill and spell absorption). Atronach is well suited to a character that is built to get hit by enchanted weapons and enemy spells. If you use lots of destruction magic and no weapons, you will have a pretty high magicka consumption, so that is a consideration. Summoning helpers, using illusion and augmenting weapons tend to be less magicka-intensive magey ways to fight.
Assuming you build your battlemage to be pretty sturdy and flexible with spells and weapons, they can be strong at all levels and quite forgiving. A pure mage is also extremely strong, but takes more time to get there and can struggle some at lower levels.
Good luck. Oh, and don't let anyone try to define what a class should be in a single player game for you.