
Dunno what these 'reviews' have to say but I can't see how the patch can do anything but good. It corrects known problems - doesn't introduce new ones.
Specifically, apart from adding scenery features like bridges that were omitted it corrects an autogen handling problem and a serious ground texture problem where crashing was caused by landclass/seasonality issues. The latter could well be the cause of your problems.
IMO anyone who tells you their sim is running worse after installing it is plain wrong - but as you can uninstall it anyway and replace the files it changes, I can't see what's to lose.
Trouble is that many people cock-up the installation of addons and then try to blame everyone but themselves when things go wrong - I'm not saying or even implying that this applies in any way at all in this case ;)