I was put off by the new plastic trigger guard/housing on the new 10/22 until I finally bought one.
Now I can say for a fact that it's a non-issue. It doesn't make a lick of difference and I don't notice it at all.
It's funny that when folks are looking for opinions in a bolt gun or semi-auto pistol, the first suggestions that invariably come up are the Tikka T3 and Glock, and both of those firearms have a LOT more plastic in their construction than a 10/22 in lowly .22LR.
As an interesting side-note, the plastic parts on my 10/22 seem MUCH more nicely finished (i.e., no mold flashing and no color variations) than those on just about every Glock I've ever handled.