Nowadays the border of game genre is becoming increasingly indistinct. The website of gamesradar has released an article about this.

The details are as below:

I may be PC Gamer's "first-person shooter guy," but I actually love playing all kinds of PC (and yes, even console) games. And in reality, the definition of "shooters" is rapidly evolving. When making gaming recommendations to friends, I find it increasingly difficult to pigeonhole games into clear-cut genres. Readers looking to embrace the genre commonly ask me which shooter to try out...but that's a loaded question (no pun intended) with only one practical answer: It depends. Gamers can look to the kinds of games they enjoy playing, and find an FPS that includes those elements. In the same way, non-shooter games that an FPS-lover will enjoy often include shooter elements not featured in other games of that genre. For example...

Role-playing
Most RPGs are played from a third-person over-the-shoulder perspective, but I've found that those portraying the action from the first-person perspective have much more exciting combat. Two games that have done this really well are Deus Ex and Mass Effect, both of which demand that you manually aim when firing weapons, so you're not completely dependent upon character statistics when trying to survive a firefight. You're simultaneously juggling RPG character abilities and feats with accurate sharpshooting, and it makes for more engaging combat.

Above: Dice rolls and character feats will only get you so far; what kind of soldier would you be if you couldn't point and shoot your gun?

Similarly, BioShock and S.T.A.L.K.E.R. are first-person shooters that benefit from RPG elements. Running and gunning gets more interesting when you have to worry about character advancement, weapon customization, and inventory management, too.

Massively Multiplayer
Online persistence is a very attractive proposition for statistic-obsessed first-
person-shooter players, and quite a few action games have launched with the
ongoing stat-tracking and performance-based unlockables that would normally be associated with MMOs. Battlefield 2, Rainbow Six Vegas, and Call of Duty 4 are all shooters that accent addictive gameplay by rewarding players for continuing to play.

MMO junkies that want to be eased into the first-person-gaming environment should keep an eye out for The Agency, the upcoming spy-themed MMO that'll make use of twitch-based gunfights (i.e., a headshot will count as an instant kill).

Eventually, the lines differentiating genres will blur enough that great shooters will stand on their unique merits and innovative feature sets without worry about being compared to other games sharing the same market space. It might make recommending games even more complicated, but that's one challenge I look forward to.

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Resource: gamesradar