I have also tried using FCX. It's fine for small commercials without VFX, and for 2-3 minute corporate jobs and web videos.
To be honest it really doesn't matter what you use, as long as it works for you.
What most people don't understand is that you don't have to lock yourself into one piece of software. Just like a DP will choose the right camera for the job, you can choose the right edit software for the job as well.
I prefer to use Avid for cutting drama. It's stable, it works with every post-house system for effects, grading and sound. Plus, there is a lot more structure to drama so you can usually organise things better in the timeline.
It handles RED and Alexa footage well.
For Music Videos I prefer FCP7. I often have 100 tracks of performance that all need to be synced to the music, and stay in sync. I can layer the tracks by chorus/verse, or by location and then cut the bits I need. A lot of people look at my timelines and freak out, but it's organised and I can cut quickly - pumping out a finished edit for online in 2-3 days. I transcode the RED rushes to SD prores first (usually on-set) because no editing software can handle that much data. It's impossible to edit like this on FCX, and a lot of the tools like auditioning etc, make it hard to keep sync. I also don't want the footage to "disappear" so I can focus on the edit. I want to know exactly where each clip is and what it contains so I can use it where and when I like. I can only have that on a track based editor.
For commercials and corporates, I use FCP7 or sometimes Premiere (If I'm dealing with clients that have existing data on windows drives etc.) I personally hate Premiere, but other people swear by it. It has a lot of good tools like dynamic linking and integration with AE/PS, but I find the shortcuts clunky and generally I prefer FCP7. I've played around with FCX on these and it's ok, but I am just faster on a track based editor. FCX is good for color matching and sound tweaks.
Personally, I'm looking at Lightworks as my next tool. It's really only on windows right now and I'm not ready to jump ship from Mac entirely. The best thing about it is that it's the same on Windows, Mac and Linux... and it's completely free (or $60 a year for the pro version). I'm hoping there is at least a Beta version for mac by the end of the year to have a play with.
But a good editor isn't a software operator. Editing is a skill, and part of that skill base requires knowledge of multiple tools and choosing the best one for the job at hand.