Don't get me wrong, Sonar X3 is working for me, and my quibbles have grown smaller with every release. No other DAW offers me the flexibility and ease of use. But there are still things, not so little things really, that I wish for.
(and no, I was ubable to limit it to three... so I went with lucky 7)
1) timeline/tempo map overhaul
2) Improved tempo detection
probably my single biggest frustration today. Almost any piece benefits from 'breathing', that is, the tempo changes slightly from time to time. If I could get tempo detection to work I can play the timeline in, but that is difficult with the current AudioSnap, and almost impossible with the current tempo map.
3) better automation drawing tools, or maybe something like expression maps
my second biggest frustration... and maybe I am just doing it wrong, but I find this to be very frustrating, and I need to do it a lot! If anyone wants to show me the error of my ways please do!
4) nested folders
not everyone needs these, I know, but when I have 100+ instrument tracks it would make managing them (or even finding them) a lot easier.
5) arbitrary routing for audio and MIDI
it would let us be so much more creative!
6) easier ACT configuration
hopefully, by the time X4 is released I will have finished mapping everything to my physical controllers<G>, but I do wish it was easier to manage.
7) fix the bugs in the plugin manager
nuff said. While it would be lovely if it was a once and done thing, it isn't for me.
There are other bugs, but really, I seldom run into problems these days. And when I do they are usually self-inflicted (e.g. running out of memory or horsepower.)
I have been pleased with the progress since V8, and hope no one at baker central considers any of these to be complaints - rather, they are just things that would make this customer's DAW life a bit easier. I recognize that not everyone shares these priorities.