They hand out patents like candy, even invalid ones. The real question is, can the patent you get stand up to challenge or be be successfully enforced. Try to enforce your patent, then you'll find out if it passes muster. Otherwise, they're happy to take your money and rubber stamp your patent. (plus, patents can be challenged as well, so why not let challengers or the people someone is trying to enforce a patent against do all the work of identifying and weeding out invalid patents). If you ever try to get a patent, get a patent lawyer, dont' use those stupid 'give us 50 bucks and we'll help you file your patent' type businesses. Just because you succesfully file a patent, doesn't mean you have an enforceable patent, or the broadest possible patent you could get (w/out being too broad - a patent can be void for that alone).
Trademarks can be voided too, but its much easier to have a valid trademark, you can trademark practically anything, even a color. And trademarks are automatic (but its still good to register so you have proof of how long ago it was you started using it, and so you can get better damages should you need to enforce it some day). On the other hand, the rights you get in a trademark aren't nearly as exclusive, others can still use your same trademark if they are in a different enough of a business (if customer's won't be confused by their use of the same trademark - they can use it). You can lose a trademark in ways that are out of your hands as well - like if it becomes generic (think asprin - used to be a brand name, but people started calling any asprin like product 'asprin' - no matter what company made it - and the trademark was voided for becoming generic - at which point any company who wanted to could from then on use the word 'asprin' on their products to their hearts content - which they did. This, I suspect, is the reason the 'band-aid' jingle changed about a decade or 2 ago from 'I'm stuck on band-aid and band-aid's stuck on me' to 'I'm stuck on band-aid *brand* and band-aid's stuck on me' - they are trying to avoid sharing the same fate as asprin). This is why companies feel the need to actively defend their trademarks too, so you see things like lucasarts going overboard and threatening to sue 12 year old kids who make star wars mods for UT.
I haven't looked at IP law for about a decade though so my info could be outdated (from what I understand it has gone through a lot of changes lately).