yes there is the issue of the rather ridiculously broad user agreement that reads like you're signing every piece of info you use online to google for whatever they want, which is not really on and a worry anyway with google, which makes me want to switch to broader search engines where this isn't an issue, it's really rather annoying if anything else.
Also you can do pretty much what it does with firefox's addon's except firefox is a bit slower, you can remove and add more features with it firefox too which is handy, it will probably develop but i reckon firefox will too. ie can fk off tho.
the whole thing about having multiple processes instead of threads is the same architecture that is used with modern operating systems to prevent the whole OS going down when an app crashes, but it does mean a substantially larger footprint to chrome as a whole.
re. the user agreement, we are now entering the age of cloud computing where practically everything will be stored on the .net. witness the cheap netbooks (underpowered tiny laptops that sell for 200 quid) making a big hit with people. there are definitely concerns with google, not so much for instability, but more for privacy and whether its the right thing for a private company to hold so much of the nets infrastructure.
however its not like anyone else is really any better. ms has a new search engine, but i'm not trusting them either. even mozilla corp (the company associated with mozilla.org, set up to process the millions of earnings from google searches performed through the firefox search tool) has caused a massive row cos they want to insert what is essentially spyware into the next version of firefox. it uploads your browsing stats to website owners, apparently anonymous. and let me tell you as a computer programmer, thats utter bullshit - there is no anonymity on the net.
many people find it shocking that someone is making money from all those dedicated open source programmers efforts. fucking advertising. if it didn't pay my bills too, i'd hate it even more.
take your choice about who will view your data. myself, i'm not blind to googles faults, but i find their mash-ups of search, map and other data to be astonishingly innovative, and right now i'm throwing my lot in with them.