Plastic sights are more fragile than steel sights when it comes to impacts. Some are more easily displaced from their position by even mild impacts or pressure, too.
I don't mind plastic sights on my 99-series pistols, but I replace them with steel night sights on my Glocks, as I did on my early production CS45.
HK paddle magazine release
Don't mind "paddle type" magazine levers. I actually like the early style short ones on my SW99's, and never minded them on the HK's. It's just another training issue to me.
Since the only firearms I'd like to "admire" for their aesthetics are lever rifles, and some SA revovlers, I don't consider the "ugliness" factor for dedicated defensive/working guns.
Springfield XD, XDM, XDS grip safety.
Unless there's a mechanical issue involved, I don't have anything against a grip safety. Granted, I've seen how some less experienced shooters may sometimes rush acquiring their grip, or exhibit an improper grip, which might fail to engage a grip safety. I consider that a training issue, though.
Smith & Wesson M&P "just ok" trigger.
The definition of "just okay" is something I'd consider applicable to the wide range of service-style plastic pistols in the current market.
Having been a longtime SA & DA revolver shooter, a 1911 shooter and then a TDA (also called DA/SA) pistol shooter, the modern crop of relatively inexpensive plastic service pistols are, to me, mostly studies in varying shades of triggers that are ... "okay". Some run to one end or the other when it comes to the range of "good" or "not-so-good".
A notable exception, to me, is the trigger mode available in the AS (Anti-Stress) model of the Walther 99 series. The DA trigger press is surprisingly pleasant for its type, and the SA trigger press is excellent. (It's listed as being very slightly lighter in weight than the PPQ variant of the 99 series, but the PPQ trigger is actually measured as having 3 "stages" of travel as discussed in the armorer specs, so there are probably some minor differences from an engineering perspective.)
I own a couple of M&P's ('08 & '10 production) and have an issued one (new production M&P40). I've been handling and using a fair number of them since about '07 (after my first M&P pistol armorer class), and they've become increasingly better as the company has apparently been responding to different segments of its market demographics.
For example, a recent production M&P9 Pro 5" I tried, which is actually the duty weapon of another instructor I know, has an outstanding "trigger" and is a very capable tack-driver.
The new production M&P40 I was issued has a very good "trigger" for service-type pistol, and is one of the softest shooting .40's I've ever used. The practical accuracy is every bit as good as anything I've experienced with my other .40's (Glock, S&W 3rd gen's and 99's), so it seems the "triggers" are good enough for my needs.
At the end of the day, all of these "features" are more than a little subject to the individual doing the "evaluation" ... and spending their own hard-earned money.