Tony,
I agree with most of what you have said. I will fully admit I am not the biggest proponent of Komatsu as a general line. That being said, there are a few machine lines they make that I am impressed with. The two that jump instantly to the front of my mind are the loader and excavator lines. I have spent a fair amount of time in both, and the only real complaint I have is that when I get everything set so it's comfortable for me to reach in the WA380's we have at work, I continually hit my right knee off the steering column. I admit, that's a pretty minor complaint. Overall, I would have no issues in running a Komatsu loader all day.
With the excavator line, I can find no faults at all. They are strong, fast, have good control....basically, I like 'em.
I am not, nor have I ever been a fan of their dozers. I find them to ride rough as a general rule. I also find the layout of the cabs on the machines I have been on was sort of like sitting on an apple crate with the controls piled around you. Not overly comfy....unless you had the seat reclined, feet on the dash and were...ummmm....resting. They accel at that.....very comfy to sleep in.
I am not a huge Cat fan for all things. I do like some of their products, but despise some others. One example of the latter is the excavator line. I wouldn't give two thoughts about digging a big hole and burying one. I liked the old 205,215,225,235,245 lineup, but haven't been even remotely impressed with anything they have put out since.
I do see issues with Komatsu service life. I have been on a D85 with less than 100 hours on the clock where the trim inside the cab was already rattling very loudly. From both operating and pulling wrenches on them, I find they tend to require a bit more attention than some other brands do as the hours mount up.
My biggest issue has been with parts however. Perhaps it was a specific problem with the particular machines, or it may have been the dealer, but just last year, I watched one of our contractors sit idle with two PC1250's and a PC1100 while they waited for hydraulic parts. The PC1100 was the first to get the parts in after a mere 3 weeks. One of the 1250's was down for about 6 weeks, and the other for almost 3 months. I also know the same contractor sold their 825 grader since it was actually spending more time waiting for parts than it was working. That is not an exaggeration either, it was actually down more than it was up.
After having said all that, I am not one who will wave a particular manufacturers flag and proclaim them to be the only one that can build machines. I think most make certain groups of products well, and the rest about average...or in some cases below...Cat included.
Brian