It was a great aircraft to fly, responsive, with pleasantly light progressive controls; generally viewed as a 'pilot's aeroplane'. It was fairly unreliable, always some fault or other, though this was seldom a problem due to the backups and redundancies in almost all the systems. This, combined with poor fuel economy, made it quite an expensive aircraft to operate. It had a very strong and forgiving undercarriage, so most landings were classed as 'good' by the passengers, even if it was rather plonked on.
It was a busy flightdeck, with plenty of quirks and traps for the unwary. Particularly, the 146 didn't have autothrottle, just a throttle trimming system called TMS, meaning only one vertical mode could be set in the autopilot. The gotcha would be after levelling off at cleared altitude, and being given a speed, to set IAS to hold that speed, which then released the Alt Hold, and an altitude bust was very likely as only the power setting controlled altitude from that point on. You very quickly remembered not to make that mistake again! The RJ had autothrottle which made it simpler. Often the yaw damper was not working as it should, and cabin crew, especially at the back complained of a continual yawing / rolling sensation which could make them feel nauseous.
Flaps, as stated above, were dramatic. The step from between 0 and 18 degrees, causing both a dramatic pitch on their extension and retraction, and the loud noise they made travelling between these 2 stages. But you soon got used to that, making it a non event for the flight and cabin crew alike. With full (33 degree I recall) flap and the speed brake out for landing, it was very draggy, and could be landed in a short space.
It was very under powered - fine on T/O and initial climb, but regularly running out of puff above 20,000', especially in warmer climates. The 146 wasn't RVSM, but that wasn't a significant limitation because they seemed like they anything left when they finally struggled up to 28,000'. The joke was, why did it have 4 engines? Because there wasn't room to fit 6. Some said it just had 5 APUs. But it was flyable on 3 engines - I did a 3 engine ferry (remember the unreliability?), and it was a regular into London City Airport, which was always fun and always interesting - great views of London at close range.
It was of course the most infamous toxic-air culprit, with regular wet sock smells on first using bleed air, especially from the APU.
Hope this helps with your question.