First of all, you should note that only a very small percentage of users of most any product ever bother to post to a forum, and of those the vast majority tend to be the more vocal types in regards to comments, usually for the worse (frankly if you love your device and you're not a techy, you're not likely to bother singing praise all over the internet). I've been part of enought forums over my life to know this (and yes, I admit to being a vocal complainer).
With that said, I think the X10 is a fabulous piece of hardware (as I mentioned in my Wish List posting). Overall, I'm very happy with my choice. But that's not to say the product is perfect. You'll find a fair share of complaints over any other smartphone.
Software issues can always be easily managed through updates by the manufacturer or through using 3rd party apps. I know Timescape and Mediascape are key selling points of the X10 from SE's standpoint, but I think they've been neglecting how good the hardware is in doing that. Mediascape is the better of the two apps from my point of view, but that's not to say that Timescape can't be a great app to some people or to me even with some tweaking.
In the end, it'll come down to your own judgement. I recommend giving it some time to try it out and let the battery settle in. It's good to read and research a purchase before making one (I always do extensively), but it's very easy to get caught up in the wave of emotion from others and lose your own personal objectivity.
Samsung Galaxy S III (I747M / d2att) || Android 4.2.2 || Kernel: 3.0.67-Underwear.Kernel || AOKP Task650 3.1.2013
Samsung Galaxy Note 10.1 (GT-N8010) || Android 4.1.2 || Kernel: 3.0.31 || Redemption ROM v4.3.1
HTC EVO 3D GSM (shooteru) || Android 4.0.3 || Kernel: 3.0.16 || KingCobra3D-ICS 1.6