Here are some of the issues:
1- Sometimes you cannot delete/clear a conversation
2- Last seen times are inaccurate
3- Statuses are inaccurate (one can be typing and be offline at the same time)
4- As the conversations get bigger, hike becomes slower and slower. (Must be a database issue)
5- There are outages (sometimes messages cant be sent or delivered), making hike unreliable. Who wants to use an unreliable messaging service? Nobody.
Why I use hike? Because the UI is nice, and stickers are great. It has a lot of potential, but its also full of bugs, and (again) its unreliable.
To the developers, if you guys want a 5 star review, then work for it. Those bugs arent going to fix themselves. Thank you :)