Because it's made by Samsung.
Every experience I've had with Samsung products has left me feeling like the entire enterprise has been half-assed.
The first was their original upsampling DVD player. The one with the "trendy" super-bright blue LED on the front. Just what I want when I'm watching a movie.
Then came the BlackJack phone ... which, even giving allowances for the general instability of Windows Mobile at the time, was the most crash prone device of any kind I've ever used.
The supposedly-awesome Samsung monitors my office set me up with ... so "good" that the same color repeated just 4 INCHES apart looked completely different. Cheapy Dell screens looked miles better.
And then a Samsung Blu-Ray/Netflix player that shipped with firmware that left all audio out of sync with the video on Blu-Ray and Netflix (but was fine on DVD), and the first update for which only fixed it "sometimes". Damn thing still fails to stream after a while, even though an Xbox 360 and a Tivo sitting right next to it will work on the same content perfectly.
I'm not anti-Android - I NEED one for development, but it has to work properly and be readily updatable to new official builds of Android (I'm not testing code I plan to sell on a hacked ROM).
The Nexus One was a bust for me due to the awful PenTile display (some people seem happy with it, I saw rainbowing and color saturation issues, along with fuzzy text the first time I picked one up), and various other hardware issues, including iPhone 4 level signal attenuation issues.
The Evo 4G I loved, except the one I bought had faulty 2.4/2.5Ghz radios/antennas ... so BlueTooth, WiFi and 4G didn't work for ****. Two units in store I could have swapped for had the exact same issue. This was just faulty hardware on those units, but still - I'm not getting locked into a contract unless you can provide me with a properly working device!
Droid X is just unappealing, and I can't put my finger on why. Too many bad experiences with Motorola and Verizon perhaps.
Maybe Google will do a Nexus Two, use an SLCD (don't get me started on the still-failing promises of all things OLED), and have Evo like specs/features, in which case I'll try that route again.
But no ... no Samsung EVER again.