It is a rather strong burning rage type damage, but in my experience the shield gets blown off of you before it ticks enough times to make it worth it. For a tanky team I'd choose titan killer for sure.

The way I see the Fenix/Talandar issue is that Talandar is sort of an alternative fate for Fenix, where he never experiences half of SC1 and Brood War, and as such is a different character to Fenix as the Dragoon, but not different from Fenix as the Zealot in any way up to that point in history. He becomes different through his different experiences. While it would be cool to have every minute detail or different version of a character as a separate HoTS hero, I really doubt Blizzard will...

I'd say it is not an essential part of the concept, removing it still leaves a choice between a warrior style character and a ranged damage dealer, but I think this kit would sort of remove the reason to put Talandar in as a separate hero, seeing how most abilities are his SC2 abilities with some alterations. That is why I added him to be the third choice.