But the trademark is on the whole logo, so unless the other game uses it in the same style and color there is no problem. And the word "rebellion" is only used as a subtitle to a game. Pointless lawsuit.
The tech used in sniper looks nice, but that face looks a bit cartoonish to me, maybe it's better ingame.
Trademark law addresses consumer confusion. So it doesn't matter whether the whole logo is implicated. If a consumer is confused as to the source of goods or services, that could raise an issue in TM law. This is true even for alternate spellings. A recent case that comes to mind is the car company Porsche suing another company using the Porsch name. That's very close, so a bit of a no-brainer, but other cases are not so close.
And I'll reiterate the point that companies have a duty to "police" their marks. If they sit back and let someone use their trademark, that company risks "generification" of their mark, where it becomes generic.
This happened to the brand name of escalator. It almost happened to Kleenex and Xerox. Ever remember the "I am stuck on Band-Aid" song that was popular back in the 80s? Johnson and Johnson actually changed the lyrics to "I am stuck on Band-Aid brand, so band-aid's stuck on me," inserting the word Brand to avoid genericide. Take a look at the band-aid website, you'll see that "brand" word everywhere because they are worried about it.
See what wikipedia has to say here:
http://en.wikipedia.org/wiki/Trademark#Maintaining_rights
A trademark which is popularly used to describe a product or service (rather than to distinguish the product or services from those of third parties) is sometimes known as a genericized trademark. If such a mark becomes synonymous with that product or service to the extent that the trademark owner can no longer enforce its proprietary rights, the mark becomes generic.
My point is that while it may seem at first glance that TM lawsuits are petty and "pointless" as you say, that is just from a layperson viewpoint. Every single company has a duty and obligation to enforce their brands. If they didn't, the shareholders could sue the company for not doing it, and force them.