I own several DAW programs, and I like various aspects and features of each of them - there's nothing that says you have to stick to just one program for everything you do, and I, like a lot of people, will switch between different applications for different tasks.
However, that doesn't mean that, in a perfect world, I wouldn't like to have everything available in one application.
I do most of my work in Pro Tools. On a PC.

It's reliable as a rock for me, and I like the way the program is laid out. I find it very elegant and the metaphor of tape deck / editing block / Mixing console relates well to the way I came up with recording - which was analog decks and mixers. And IMO, that metaphor, along with the reliability, speed and ease of use and elegance of the program, have a lot to do with its popularity. The fact that it is in such widespread use is another bonus for me, because I know that something I start here can easily be taken just about anywhere and a compatable studio will be available.
However, that doesn't mean there are not things I'd like to see changed / added to PT. For me, the biggest issue is lack of MIDI notation. I've been complaining about that one for years, and it's something I had back in 1988 with an Atari running C-Lab Notator, so I don't really see a reason why they can't implement something other than a piano roll in PT. And I really HATE piano rolls - unlike notation, they require you to look at two different areas of the screen to determine note duration and pitch, and for someone familiar with standard notation, I think that slows you down. Of course, Avid's recent purchase of Sibelius may bode well for the eventual inclusion of high-quality notation in PT, but we will have to wait and see how that pans out. But for the first time in years, I have some hope in that regard.
http://www.macworld.co.uk/news/index.cfm?home&NewsID=15431 I'd also like to see delay compensation added to the LE line. And the ability to increase the I/O beyond 18 channels at 44.1 / 48 kHz, or 10 channels at 88.2 / 96 kHz. I'm not asking for third party audio interface support - beyond PT MP and the M-Audio products, I suspect that will never happen. But why not allow people to run two Digi 002 or 002R interfaces at once? Digidesign's still going to be selling hardware and making the money, and as far as I/O, there's still quite a division / gap between HD and LE. IMHO, a bit too much of one.
However, Digi's done a lot to help cover the middle ground with the recent release of PT LE Music Production Toolkit, with the much higher track count and other upscale features. But it sure would be nice to be able to run that along with 32 channel output to a analog (or in my case) digital board...
There's always something most people would want to change about any application, and IMO, the trick is to find the application that works best for you overall, and if wanted / needed, supliment that with additional programs. But for the way I like to work, PT is the best fit for me overall - warts and all.