I guess it depends on how you want to build the toon. Electric's Lightning Reflexes really helps with recharge times. Beyond that you'll either decide to go with +Def using IOs or +Recharge (you can do both, but the build can get a bit expensive)(I like keeping Recharge times high on my Electric Tanks). Softcapping to Smash/Lethal and providing some Defense to Energy/Neg Energy can do quite a bit to improve servivability as does encreasing the recharge times. True, it's not Invuln, but then Invuln doesn't have Power Sink, Electric Field or the recharge rates that Electric does. Also don't forget the mitigation you'll get from War Mace. And, with Electric recharging War Mace's attack times, you should be in for some fun times.
The down side to Electric is it's total lack of Resistance or Defense to Toxic. Toxic damage you just have to heal from as quickly as possible (hence the comment on Recharge times).
I really enjoy running my Electric Tanks (I have 3). If you look to playing to your strengths and layer some Defense in, I think you'll have a relatively unique combo and a Tank you'll enjoy playing.
Tanker Tuesdays: Meet in King's Row by IP Gate 6pm PT9pm ET.
1st Tuesday on Champion, 2nd Tuesday on Justice
3rd Tuesdays (Odd months) Freedom, (Even months) Virtue, 4th Tuesday, Tour, Server TBA
Brutal Thrashing Thursdays: Justice (ask Papa Slade when),meet in RWZ 6pm PT9pm ET.
So what do you guys think of this as a build for a Tanker?
Its not the most durable configuration I think compared to other primary sets like invulnerability for example, but it offers good build for the tanker that wants to fight the bad guys as well as take a beating off them.
I kinda like it, its low levels now, but its working out well so far.