I think generally speaking the reason togekiss isn't used much is because it shares a lot of weaknesses with pokes that are generally considered better, such as salamence and gyarados. That and in the past metagame scarftar owns it, as do jolteon and gliscor. The last nail on the proverbial coffin is that jirachi does a lot of the things togekiss does (paraflinch, setup sweeper) better, if not just because of better speed and SR weak (and immune to toxic).
That being said, if togekiss fits what you need on a team, it's quite beastly, since it's SO hard to take down without ttar/stab electric moves, and can get some outstanding coverage as well. It's just having an electric weak is tough when you need to share it with bulky waters, ice weak is tough when you share it with dragons/gliscor, and lastly outside of earthquake togekiss has a really hard time switching in.
Lastly, I do feel electric types have found bloomed in viability since the banning of latias. I have a team which runs toxic spikes along raikou and it completely runs through teams, stall or balanced, running through the new popular sets such as infernape, starmie, and zapdos, with extreme ease.