Geth Hunters make heavy use of cloaks and are almost impossible to detect, unless you observe keenly or shoot at them. Are there any ways to highlight them and find out where they are?
Mass-effect – How to locate and defend against cloaked Geth Hunters
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Related Solutions
Companion Cooldowns are much longer than for Commander Shepard. He's just that good.
For comparison -- Shepard's Concussive Shot has a base cooldown of 5.58 - Garrus' is 10, almost double. Weight has nothing to do with it - companions just take longer between abilities.
As to seeing when they're ready to be used, each ability (assuming you don't have Grenades on the companion) shares cooldowns, so whatever icon is on the hotbar will gray out during the cooldown period, gradually filling up from the bottom. When they're ready to be used again, the icon will flash white, then turn blue again, to let you know it's ready.
Cerberus deploys T-shaped barriers on the battlefield that form an orange shield wall that its agents can take cover behind, as you can see in the following screenshot taken from this IGN walkthrough video (will contain spoilers, just linked for attribution):
Taking out the shield generator will disable these barriers, immediately exposing the enemies behind them. There's also a sizable explosion which, as LessPop_MoreFizz mentions, can do significant damage to those unfortunate enough to get caught in the blast. Once the area's clear, you can move in and use the reactivation functionality to raise the barriers for your own protection.
Likewise, the barrier pylon to the left of your screenshot encases nearby individuals in their own personal barrier. It's usually a good idea to take these out as quickly as possible, to make dealing with enemies within its effective radius a bit easier.
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Best Answer
All cloaked enemies "shimmer" slightly, which can help you find them if you know approximately where they're moving.
If you just don't have a clue, open up with an automatic weapon and walk your fire across the general area. Area of effect attacks are pretty good at exposing them as well. Weapons like grenades or mines, or powers like Singularity can help.
In general, once you've done damage, their cloak will fail temporarily, giving you an opportunity to target them and do serious damage.
Another tactic which kind of works "by default" is to just wait for them to flank you - if you know they're coming, stay in cover and wait for them, and then target them with short range, high power attacks when they decloak and start to attack. It's risky, but if you're low on ammo/grenades and can't employ these other strategies, you might not have many other options.