Switching character mechanic is a little bit different.
Not all run and gun.
Bad voice acting.
AI can be really stupid.
Hit detection is awful in places.
Controls are a little bit console.
Check points aren't always in the best places.
Explosions are always nice to have in a FPS game and this Conflicts explosions are really nice. Some a absolutely huge!
Switching between the two characters is a game play mechanic that's kinda rare, you don't usually get that kind of stuff in an FPS game. The two characters don't feel a whole lot different except for the weapons. The older grumpy man is a sniper and thus is a more long range person. The younger guy is a cocky inexperienced agent who has a machine gun (similar to a M249 SAW) and he's basically the Rambo man.
Conflict is not all run and run there is some stealth in there as well. Some of the missions have different ways to the objectives. Obstacles such as machine gun nests have different ways to tackle them such as flanking etc.
Another good thing about this game is the intense firefights, sometimes there's all hell breaking loose.
The games story is nether good or bad, it's just weak. I guess the developers just thought that a decent story would get in the way, obviously they've not played COD4.
A game must have good voice acting and this game just hasn't. The old grumpy sniper is passable as a voice actor but the rest are just awful.
AI or is it AU? (artificial unintelligent). The AI can be very stupid at times, running right at you or standing still while shooting at you.
I shot you, I shot you! When I shoot someone I expect them to fall over dead not just keep on running. Just like when I shoot someone with a sniper rifle I don't expect them to keep on shooting at me. Quite frequently you'll shoot someone five times with a sniper rifle to down them. Hmmmm......
I hate games that have console style menus and having to press one key to perform for just about every action. Press space to activate something, press space to climb up something...you get the general idea. Hello developers there are 104 keys on a keyboard why not use more of them? For example the grenade menu, hold down G and then press up,down, left or right to select a type of grenade to equip it.
Checkpoints, I don't particularly like or hate them but some of the checkpoints are in the wrong place.
Overall this game certainly won't win any awards but if you want a pure action game then this is for you. If you want a more intelligent action game with a story then you're looking in the wrong place.