From the description in the Store:
CHOOSE YOUR FAVORITE CLASS
> 4 customizable classes that you can level up across single- and multiplayer
> Find the play style the suits you: Assault, Heavy, Recon, or Sniper
> Activate class-specific skills by earning and spending Skill Points
> Epic team clashes in Squad vs. Squad matches
> Talk to other players in Global and Squad Chat
> Individual and Squad leaderboards
> Win cool rewards in the limited-time events
> Accumulate XP and level up by playing both single-player missions and multiplayer matches
> Unlock higher-tier weapons by mastering lower-tier ones
> Customize the perfect weapon using a host of attachments
INTENSE SOLO CAMPAIGN
> Fast-paced story missions with various challenges taking you from Tokyo to Venice
> Play the new Spec-Ops missions for a real adrenaline rush
> Flawless graphics, music and voice performances with seamlessly integrated cutscenes
This is far too big a title to cover with static screenshots, but there are videos online from the iOS and Android versions and these will give you a good idea of whether it's worth dipping into your wallet. And hey, at least Gameloft hasn't gone down the freemium route this time, so credit to them for this.
Incidentally, although I (Steve) haven't got time to play through this for many tens of hours, I'd welcome a review for the site from a serious Windows Phone mobile gamer. If this sounds like you then please get in touch.
Modern Combat 5 does note that it 'requires an Internet connection'. Presumably for state saving, multi-player liasing and the downloading of new missions and content, as they become available. Not usually a problem, but again, keep some storage space free on your phone and don't expect to be able to play this in the middle of nowhere!
I came across this video on YouTube, showing off the extensive gameplay and graphics quite well: