By a 2 turn stun do you mean off the countdown tile? Because my blues at 3 covers and it's already stunning for 2 turns.
I hadn't really played with DD in the past, partly because of a lack of covers but also because he was viewed as underpowered and therefore not worth the . After playing the Gauntlet with him, I think I have changed my tune quite a bit. I still don't have him fully covered at this point 4 3 5 lvl 95, but he was a TON of fun. I ran him in almost every battle that I could use him. He works really well with X-Force and Patch, and the stun saved my butt several times, even at 3 covers.
There are other guys that I have as a higher priority on my leveling list, but he now has a spot someday. To people with him maxed, would you say the above build at lvl 185 (the Gauntlet boost) is a rough approximation of how he might play at 166? I do want to get the to 5, but that being said, his purple helped quite a bit against guys like Blade and even just killing Cage's before big moves.
I really don't understand the love for the red ability. For 8 AP you get barely the hopes of some day maybe getting 3k damage. But then the trap is put on a tile on a bottom corner where it is never matched or eventually destroyed by an ability without triggering it. And I personally haven't managed to match it myself more than once. Not to mention that is absolutely useless against Daken, Blade, Luke Cage, Magneto, 4hor and anyone else who can place red special tiles that overwrite it. So let's recap:
-Cannot be used against a significant number of the top characters.
-More often than not doesn't deal damage immediately.
-There's a significant risk of it actually never doing anything at all during the game.
-It's not even a particularly efficient AP-to-damage ratio if triggered by yourself.
Radar Sense, on the other hand it's an awesome companion to Berserker Rage and a great counter to many characters, including all the ones that Ambush is bad against. It's not particularly great damage, but it's decent, reliable utility.